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Math Help - Two problems, help please

  1. #1
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    Two problems, help please

    I have two problems that I can't figure out.

    1.) if f(x) = 3x^2 - x +c and f(3) = 18, What is the value of C?

    2.) if f(x) = 2x+5/X-A and f(0) = -1, what is the Value of A?

    Thanks in advance!!!
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  2. #2
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    Quote Originally Posted by MathMack View Post
    I have two problems that I can't figure out.

    1.) if f(x) = 3x^2 - x +c and f(3) = 18, What is the value of C?

    2.) if f(x) = 2x+5/X-A and f(0) = -1, what is the Value of A?

    Thanks in advance!!!
    I'll show you how to solve the first problem and leave the second for you:

    1. f(3) means that you should plug in the value 3 instead of x:

    f(3)=3\cdot (3)^2-3+c=18

    2. Collect all constants at the RHS and you're done. I've got c = -6
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