SOLUTION: Given that f(x) = 2x + 1 and g(x) = -5x + 2, solve for f(g(x)) when x = 3.

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Question 976362: Given that f(x) = 2x + 1 and g(x) = -5x + 2, solve for f(g(x)) when x = 3.
Found 3 solutions by josgarithmetic, MathTherapy, Edwin McCravy:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The composition, 2%28-5x%2B2%29%2B1=-10x%2B4%2B1=-10x%2B3.

x=3,
-10%2A3%2B3=-27.

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

Given that f(x) = 2x + 1 and g(x) = −5x + 2, solve for f(g(x)) when x = 3.
highlight_green%28f%28g%28x%29%29+=+-+25%29

Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
Given that f(x) = 2x + 1 and g(x) = -5x + 2, solve for f(g(x)) when x = 3.

That means f(g(3)).  Substitute 3 for x in g(x) = -5x + 2, then take what
you get and substitute that for x in f(x).

f(x) = 2x + 1 and g(x) = -5x + 2.
First find g(3) by substituting x=3 in g(x) = -5x + 2
                                       g(3) = -5(3) + 2
                                       g(3) = -15 + 2
                                       g(3) = -13

Then substitute x=-13 in f(x) = 2x + 1
                       f(-13) = 2(-13)+1
                       f(-13) = -26+1
                       f(-13) = -25 

Edwin