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Math Help - Evaluating Expressions for Function Notation

  1. #1
    countryrene
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    Evaluating Expressions for Function Notation

    I need help with two problems please.

    1) f(x)=x^2-7x+10
    a) find for f(0)
    b) find for f(5)
    C0 find for f(-2)



    2) f(x)=5x-1
    a) find for (a-2)



    Thanks for anyone's help...........
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  2. #2
    MHF Contributor kalagota's Avatar
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    Quote Originally Posted by countryrene View Post
    I need help with two problems please.

    1) f(x)=x^2-7x+10
    a) find for f(0)
    b) find for f(5)
    C0 find for f(-2)
    ...........
    all you have to do is to replace x with the one inside your parenthesis..
    for example, from your function, if i am looking for f(1), then it is equal to (1)^2 - 7(1) + 10 = 4.. now, can you do for your question?

    Quote Originally Posted by countryrene View Post
    2) f(x)=5x-1
    a) find for (a-2)

    Thanks for anyone's help...........
    if it is f(a-2), then just like the one above, just replace x with a-2..
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  3. #3
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by countryrene View Post
    I need help with two problems please.

    1) f(x)=x^2-7x+10
    a) find for f(0)
    b) find for f(5)
    C0 find for f(-2)
    f(0): Just plug in 0 for x:
    f(0) = 0^2 - 7 \cdot 0 + 10 = 0 - 0 + 10 = 10

    You try the other two.

    Quote Originally Posted by countryrene View Post
    2) f(x)=5x-1
    a) find for (a-2)
    Again, just plug in a - 2 for x:
    f(a - 2) = 5(a - 2) - 1 = 5a - 10 - 1 = 5a - 11

    -Dan
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