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  • Perplex
    IB Math AAHL
    /
    Quadratics
    /

    Problem Bank

    [Maximum mark: 11]

    Consider the function ​f(x)=25x−k⋅5x+1+1​ where ​k>0.

    1. Find the range of values of ​k​ for which ​f(x)​ has two real roots.

      [4]

      To earn a crown, get your answer ready before you reveal the options!

    The graph of ​y=f(x)​ has a minimum at ​y=−3.

    1. Find the ​x​-coordinate of the minimum, giving your answer in the form ​logb​(a), where ​a,b∈Z.

      [7]

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