SOLUTION: 2 for the function f(x)=3x - 2x + 5, find f(1), f(-2) and f(a).

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Question 159513This question is from textbook saxon geometry
: 2
for the function f(x)=3x - 2x + 5, find f(1), f(-2) and f(a). This question is from textbook saxon geometry

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

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


f%281%29=3%281%29%5E2+-+2%281%29+%2B+5 Plug in x=1.


f%281%29=3%281%29-2%281%29%2B5 Square 1 to get 1.


f%281%29=3-2%281%29%2B5 Multiply 3 and 1 to get 3.


f%281%29=3-2%2B5 Multiply -2 and 1 to get -2.


f%281%29=6 Combine like terms.


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# 2

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


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


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


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


f%28-2%29=12%2B4%2B5 Multiply -2 and -2 to get 4.


f%28-2%29=21 Combine like terms.

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# 3


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


f%28a%29=3a%5E2+-+2a+%2B+5 Plug in x=a. Since there are no common terms, we cannot simplify further.