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Math Help - evaluate function

  1. #1
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    Cool evaluate function

    Need help to simply this problem: If p(x)=8x+9, find p(-3)
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  2. #2
    Senior Member DivideBy0's Avatar
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    Quote Originally Posted by elicia View Post
    Need help to simply this problem: If p(x)=8x+9, find p(-3)
    If you have p(-3), simply substitute it into the formula where x is:

    Hence, p(x) = 8x + 9
    so...... p(-3) = 8(-3) + 9 = -24 + 9 = -15

    In general:
    If you have p(something), substitute something into the formula where the variable which the formula is concerned with used to be:

    e.g

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

    etcetc
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