• maksimum dari y

    x = -b/2a
    x = -(-3)/2(1)
    x = 3/2

    f(3/2) = (3/2)^2 - 3(3/2) + 2
    f(3/2) = 9/4 - 9/2 + 2
    f(3/2) = 9/4 - 18/4 + 8/4
    f(3/2) = -1/4

    jadi nilai maks nya -1/4

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