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27 votes
27 votes
What is the substitution for f7=3(x)^2+2(x)-9

User Powtac
by
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1 Answer

7 votes
7 votes

Given a function f(x), whenever you want to evaluate the function, you simply change the variable for the value you where you want to evaluate the function at, and then perform the mathematical operations the function tells you to do.

In our case f(x) = 3x^2 + 2x -9

If we evaluate f(x) at x=7, then


f(7)=3(7)^2+2(7)\text{ -9 = 3 }\cdot\text{ 49 + 2}\cdot\text{ 7 - 9 = 152}

So f(7) = 152.

User Sandeep Dhiman
by
2.7k points
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