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    NationalHardAlgebra10–12

    Functions & Graphs

    Funções e Gráficos

    The function f(x) = x^{2} - 6x + 8. Find the vertex, axis of symmetry, and x-intercepts.

    Complete the square or use x = \dfrac{-b}{2a} for the vertex. Factor for x-intercepts.

    Solution

    Step 1 of 4

    1. 1.x-intercepts: x^{2} - 6x + 8 = (x - 2)(x - 4) = 0 \Rightarrow x = 2, x = 4