I am having trouble with functions the question is to find the indicated outputs for f(x)=4x^2-2x

Can someone please explain?

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  1. f (0) = 4 * 0 * 0 - 2 * 0
    = 0

    f(-1) = 4 *-1*-1 - 2*-1
    = 4 + 2
    = 6

    f(2) = 4*2*2 - 2*2
    = 16 - 4

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