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  • Perplex

    Concept Lessons

    Access comprehensive explorations for all concepts in your objective, including problems, helpful visuals, and AI features.

    What you'll find in every lesson:

    High-quality explanations: Each lesson is carefully crafted to help you truly understand the concept, not just memorize it.

    Checkpoint exercises: Practice as you learn with interactive problems designed to reinforce your understanding.

    AI-powered discussions: Engage with thought-provoking questions that help reveal your misconceptions.

    What you'll find in every lesson:

    High-quality explanations: Each lesson is carefully crafted to help you truly understand the concept, not just memorize it.

    Checkpoint exercises: Practice as you learn with interactive problems designed to reinforce your understanding.

    AI-powered discussions: Engage with thought-provoking questions that help reveal your misconceptions.

    Concept Lessons

    Access comprehensive explorations for all concepts in your objective, including problems, helpful visuals, and AI features.

    61 Lessons Available

    What you'll find in every lesson:

    High-quality explanations: Each lesson is carefully crafted to help you truly understand the concept, not just memorize it.

    Checkpoint exercises: Practice as you learn with interactive problems designed to reinforce your understanding.

    AI-powered discussions: Engage with thought-provoking questions that help reveal your misconceptions.

    What you'll find in every lesson:

    High-quality explanations: Each lesson is carefully crafted to help you truly understand the concept, not just memorize it.

    Checkpoint exercises: Practice as you learn with interactive problems designed to reinforce your understanding.

    AI-powered discussions: Engage with thought-provoking questions that help reveal your misconceptions.

    Cartesian plane & lines

    Thumbnail for Distance, Midpoint, & Gradient

    Distance between two points, midpoint of two points, and finding gradient using two points

    Distance, Midpoint, & Gradient
    Thumbnail for Equations of a Line

    Gradient-intercept form, point-gradient form, vertical lines, horizontal lines, standard form of a line

    Equations of a Line
    Thumbnail for Line Intersections & Systems of Equations

    Parallel and perpendicular lines, intersection of 2 straight lines, solving a two-variable system of equations

    Line Intersections & Systems of Equations

    Quadratics

    Thumbnail for Foundations of Quadratics

    Vertex, standard, and factored form, axis of symmetry, concavity, quadratic formula

    Foundations of Quadratics
    Thumbnail for Applications of Quadratics

    Evaluating the discriminant, sum and product of roots, quadratic inequalities, quadratics of other forms

    Applications of Quadratics

    Function Theory

    Thumbnail for Functions and their properties

    Domain and range of functions, function as a model, interval notation

    Functions and their properties

    Powered by Desmos

    Graphing functions with a calculator, characteristics of a function, even and odd functions, x and y intercepts, horizontal and vertical asymptotes, maxima and minima

    Function Graphs
    Thumbnail for Function Composition & Inverses

    Composing functions, inverse functions, graphing and evaluating inverse functions, computing inverses and domain restrictions

    Function Composition & Inverses (Plus Only)

    Exponents & Logarithms

    Thumbnail for Exponential Algebra

    Exponents, properties of exponents, and solving exponential equations

    Exponential Algebra
    Thumbnail for Radicals and Roots

    Nth roots, fractional and rational exponents, conjugates.

    Radicals and Roots
    Thumbnail for Logarithm algebra

    Definition and evaluation of logarithms, properties of logs, e and the natural log, change of base rule

    Logarithm algebra
    Thumbnail for Exp & Log functions

    Graphing exponential functions, exponential growth and decay, logarithmic inverse functions.

    Exp & Log functions (Plus Only)

    Approximations & Error

    Thumbnail for Rounding Numbers

    Rounding, significant figures, decimal places

    Rounding Numbers

    Powered by Desmos

    Converting numbers to and from scientific notation (a×10k)

    Scientific Notation

    Sequences & Series

    Thumbnail for Arithmetic Sequences

    Introduction to the definition, properties, and general term of an arithmetic sequence

    Arithmetic Sequences
    Thumbnail for Geometric Sequences

    Introduction to definition, identification, and general term of geometric sequences

    Geometric Sequences
    Thumbnail for Arithmetic Series

    Definition of series, formula for arithmetic series

    Arithmetic Series (Plus Only)
    Thumbnail for Σ summation notation

    Summation notation, properties of sums

    Σ summation notation (Plus Only)

    Powered by Desmos

    Definition and general term of geometric series, finite and infinite series, convergence

    Geometric Series (Plus Only)
    Thumbnail for Sequence Mode (Calculator)

    Working with sequences on a calculator, computations and applications of a calculator

    Sequence Mode (Calculator) (Plus Only)
    Thumbnail for Compounding (Appreciation & Depreciation)

    Compound growth, depreciation, interest, inflation, real value

    Compounding (Appreciation & Depreciation) (Plus Only)

    Counting & Binomials

    Thumbnail for Pascal's Triangle and nCr

    Theoretical introduction to n​Cr​, or (nr​), and Pascal's triangle.

    Pascal's Triangle and nCr
    Thumbnail for Binomial Theorem

    Using nCr​ to expand binomials like (1+2x)7.

    Binomial Theorem (Plus Only)

    Proof and Reasoning

    Thumbnail for Proof by deduction

    Introduction to the concept of proofs, proof by deduction, and proof with even and odd numbers.

    Proof by deduction

    Transformations & asymptotes

    Thumbnail for Linear Transformations

    Vertical and horizontal translations, dilations, reflecting over axes

    Linear Transformations
    Thumbnail for Rational functions

    Reciprocal functions, quadratic denominators, graphs of rational linear functions

    Rational functions (Plus Only)

    2D & 3D Geometry

    Thumbnail for Right angled triangles

    Pythagoras's theorem, SOHCAHTOA, finding side length from angles

    Right angled triangles
    Thumbnail for Non-right-angled triangles

    Sine and cosine rules, finding general area of a triangle

    Non-right-angled triangles (Plus Only)
    Thumbnail for Circles: Radians, arcs and sectors

    Measuring angles in radians, circumference & arc lengths and sector areas

    Circles: Radians, arcs and sectors (Plus Only)
    Thumbnail for Applied triangle geometry

    Angles of elevation and depression, true bearings, projections and more

    Applied triangle geometry
    Thumbnail for 3D solids

    Spheres, cylinders, prisms, right cones, right pyramids, and combinations of solids

    3D solids (Plus Only)

    Trig equations & identities

    Thumbnail for Circles: Radians, arcs and sectors

    Measuring angles in radians, circumference & arc lengths and sector areas

    Circles: Radians, arcs and sectors (Plus Only)
    Thumbnail for The Unit Circle

    Sine, cosine & tangent functions in the unit circle

    The Unit Circle

    Powered by Desmos

    Graphs, domain, and range of sinx and cosx, general sinusoidal functions, modeling periodic phenomena, tanx and reciprocal trig functions, inverse trig functions

    Trigonometric Functions
    Thumbnail for Reciprocal trig functions

    The functions secx, cosecx and cotx, domain, range & graphs

    Reciprocal trig functions (Plus Only)
    Thumbnail for Trig Equations

    Solving equations involving trigonometric functions and understanding solution domains

    Trig Equations (Plus Only)
    Thumbnail for Trigonometric Identities

    Applications of trigonometric identities such as sin2θ+cos2θ=1, sin2θ=2sinθcosθ and more identities for HL students

    Trigonometric Identities (Plus Only)

    Differentiation

    Thumbnail for Limits and Derivatives

    The concept (and basic properties) of limits and derivatives

    Limits and Derivatives
    Thumbnail for Differentiation rules

    Power rule, chain rule, product rule, quotient rule, derivatives of ex, ax, loga​(x), trigonometric, and inverse trigonometric functions

    Differentiation rules
    Thumbnail for Tangents and normals

    Definitions of tangent and normal, finding tangent and normal lines to a function

    Tangents and normals (Plus Only)
    Thumbnail for Applications of the First Derivative

    Increasing and decreasing intervals, stationary points (maxima and minima), and optimisation

    Applications of the First Derivative (Plus Only)
    Thumbnail for Second Derivatives and Applications

    Definition of the second derivative, concavity, inflexion points

    Second Derivatives and Applications (Plus Only)
    Thumbnail for n^th Derivative

    Taking the nth derivative, inductive proofs with the nth derivative

    n^th Derivative (Plus Only)

    Integration

    Thumbnail for Definite Integrals, Areas, and Basic Anti-Derivatives

    Concept of an integral, areas with definite integrals, and basic anti-derivative solving skills

    Definite Integrals, Areas, and Basic Anti-Derivatives
    Thumbnail for Anti-Derivative Rules

    Antiderivatives of polynomials, trigonometric, inverse trigonometric, exponential, and logarithmic functions

    Anti-Derivative Rules (Plus Only)
    Thumbnail for Techniques of Integration

    The reverse chain rule, integration by substitution, integration by parts, additional strategies

    Techniques of Integration (Plus Only)
    Thumbnail for Kinematics

    Computations involving distance, displacement, velocity, and acceleration

    Kinematics (Plus Only)

    Probability

    Thumbnail for Probabilistic Events

    Theoretical and experimental probability, complementary events, expected number of outcomes, sample space

    Probabilistic Events
    Thumbnail for Combined Events

    Venn diagrams, intersection and union of events, conditional probability, independent events

    Combined Events (Plus Only)
    Thumbnail for Dependence

    Tree diagrams, selection with/without replacement, dependence

    Dependence (Plus Only)
    Thumbnail for Bayes' Theorem

    Bayes' theorem with 2 and 3 events, sum of conditional probabilities

    Bayes' Theorem (Plus Only)

    Descriptive Statistics

    Thumbnail for Population & Data

    Understand the basics of population, data collection, and sampling.

    Population & Data
    Thumbnail for Measuring Center

    Learn different ways to measure the "center," or typical values, of a set of data: mean, median, and mode.

    Measuring Center
    Thumbnail for Quartiles and Box & Whisker Plots

    Learn the concept of dispersion, range, IQR, outliers, and box and whisker plots.

    Quartiles and Box & Whisker Plots (Plus Only)
    Thumbnail for Standard Deviation and Variance

    Learn about standard deviation and variance, which we use to measure how tightly or loosely clustered the data is around the mean.

    Standard Deviation and Variance (Plus Only)
    Thumbnail for Frequency Tables, Histograms and cumulative frequency diagrams

    In this lesson, we learn about different ways to visualize frequency data, including tables, histograms, and cumulative frequency diagrams.

    Frequency Tables, Histograms and cumulative frequency diagrams (Plus Only)
    Thumbnail for Linear Regression

    Regressions of y on x, regressions of x on y, the correlation coefficient r, the rank correlation coefficient rs​, extrapolation and interpolation of data.

    Linear Regression (Plus Only)

    Bivariate Statistics

    Thumbnail for Linear Regression

    Regressions of y on x, regressions of x on y, the correlation coefficient r, the rank correlation coefficient rs​, extrapolation and interpolation of data.

    Linear Regression (Plus Only)

    Distributions & Random Variables

    Thumbnail for Discrete random variables

    Introduction and properties of random variables, probability distributions, expected value and variance, linear transformations of r.v.'s

    Discrete random variables
    Thumbnail for Binomial Distribution

    Concept of the binomial distribution, binomial PDF and CDF, expectation and variance of binomial distribution

    Binomial Distribution (Plus Only)
    Thumbnail for Normal Distribution

    Introduction and definition of the normal distribution, standard deviations, normal and inverse normal calculations, z-values, normal standardization

    Normal Distribution (Plus Only)