SOLUTION: Let f(x)= 2x-3 and g(x)= x^2+2x find the following expressions f(1) g(-2) f(3a) f(3)+g(4) Thanks for the help.

Algebra ->  Functions -> SOLUTION: Let f(x)= 2x-3 and g(x)= x^2+2x find the following expressions f(1) g(-2) f(3a) f(3)+g(4) Thanks for the help.       Log On


   

Question 62580: Let f(x)= 2x-3 and g(x)= x^2+2x find the following expressions

f(1)
g(-2)
f(3a)
f(3)+g(4)
Thanks for the help.
Answer by funmath(2933) About Me  (Show Source):
You can put this solution on YOUR website!
Let f(x)= 2x-3 and g(x)= x^2+2x find the following expressions

f(1) substitute 1 in for x in f(x) and simplify.
f(1)=2(1)-3
f(1)=2-3
highlight%28f%281%29=-1%29
:
g(-2) substitute -2 in for x in g(x) and simplify.
g%28-2%29=%28-2%29%5E2%2B2%28-2%29
g(-2)=4-4
highlight%28g%28-2%29=0%29
:
f(3a) substitute 3a in for x in f(x) and simplify.
f(3a)=2(3a)-3
highlight%28f%283a%29=6a-3%29
:
f(3)+g(4) substitute 3 in for x in f(x) and 4 in for x in g(x) and add them together.
f%283%29%2Bg%284%29=%282%283%29-3%29%2B%28%284%29%5E2%2B2%284%29%29
f%283%29%2Bg%284%29=6-3%2B16%2B8
highlight%28f%283%29%2Bg%284%29=27%29
Happy Calculating!!!!