SOLUTION: Let f (x) = x to the power of 2 + 3x -3 find f (-4) ; f (-1) ; f(-2x)

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Question 620711: Let f (x) = x to the power of 2 + 3x -3
find f (-4) ; f (-1) ; f(-2x)
Answer by math-vortex(648) About Me  (Show Source):
You can put this solution on YOUR website!
Hi, there--
.
I. Find f(-4)
This notation means find the value of the function f what is associated with x=-4. We simply substitute -4 for x in the rule for f(x).
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f(x)=x%5E2%2B3x-3
f(-4)=%28-4%29%5E2%2B3%28-4%29-3
.
Simplify the right hand side.
f(-4)=16-12-3
f(-4)=1
.
.
f(x)=x%5E2%2B3x-3
f(-1)=%28-1%29%5E2%2B3%28-1%29-3
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Simplify the right hand side.
f(-1)=1-3-3
f(-1)=-5
.
.
f(x)=x%5E2%2B3x-3
f(-2x)=%28-2x%29%5E2%2B3%28-2x%29-3
.
Simplify the right hand side.
f(-2x)=4x%5E2-6x-3
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Hope this helps! Feel free to email if you still have questions.
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Ms.Figgy
math.in.the.vortex@gmail.com