SOLUTION: Please help I am stuck on this problem f(x)=3x^2+5x-2 find F(-2),F(4)Thank you in advance.

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Question 150532This question is from textbook
: Please help I am stuck on this problem f(x)=3x^2+5x-2 find F(-2),F(4)Thank you in advance. This question is from textbook

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
# 1

f%28x%29=3x%5E2%2B5x-2 Start with the given equation.


f%28-2%29=3%28-2%29%5E2%2B5%28-2%29-2 Plug in x=-2.


f%28-2%29=3%284%29%2B5%28-2%29-2 Square -2 to get 4.


f%28-2%29=12%2B5%28-2%29-2 Multiply 3 and 4 to get 12.


f%28-2%29=12-10-2 Multiply 5 and -2 to get -10.


f%28-2%29=0 Combine like terms.


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# 2

f%28x%29=3x%5E2%2B5x-2 Start with the given equation.


f%284%29=3%284%29%5E2%2B5%284%29-2 Plug in x=4.


f%284%29=3%2816%29%2B5%284%29-2 Square 4 to get 16.


f%284%29=48%2B5%284%29-2 Multiply 3 and 16 to get 48.


f%284%29=48%2B20-2 Multiply 5 and 4 to get 20.


f%284%29=66 Combine like terms.