SOLUTION: What is the value of f(-9) when f(x)=2x to the power of 2 +3x-4

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Question 832627: What is the value of f(-9) when f(x)=2x to the power of 2 +3x-4
Answer by math-vortex(648) About Me  (Show Source):
You can put this solution on YOUR website!
Hi, there--

THE PROBLEM:
What is the value of f(-9) when f(x)=2x to the power of 2 +3x-4

A SOLUTION:
You have the function
f%28x%29=2x%5E2%2B3x-4

To find f(-9) substitute -9 for x in the function.
f%28-9%29=2%28-9%29%5E2%2B3%28-9%29-4

Now simplify the right-hand side.
f%28-9%29=2%2881%29-27-4
f%28-9%29=131

That's all there is to it.



Hope this helps! Feel free to email if you have any questions about the solution.

Good luck with your math,

Mrs. F
math.in.the.vortex@gmail.com