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21 May, 05:24

Evaluate the function below for x=3

f (x) = 2x^3-x^2-4x+9

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  1. 21 May, 07:15
    0
    Hello,

    f (x) = 2x^3-x^2-4x+9 = (((0+2) x-1) x-4) x+9

    f (3) = (((0+2) * 3-1) * 3-4) * 3+9 = ((2*3-1) * 3-4) - 3+9 = (5*3-4) * 3+9=11*3+9=33+9=42

    or

    f (3) = 2*3^3-3^2-4*3+9=2*27-9-12+9=54-12=42
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