If f(x)=3x^2-2 and g(x)=4x+2, what is the value of (f+g)(-1)
A −7
B −1
C 1
D 7

Question

If f(x)=3x^2-2 and g(x)=4x+2, what is the value of (f+g)(-1)
A −7
B −1
C 1
D 7

danielajohana · Answer

all you have to do here is plug in the equations that you have.
(f+g)(-1)
(3x^2 -2 + 4x+2)(-1)
then you combine like terms
(3x^2 + 4x )(-1)
then you solve for x and multiply it by -1 and you have your answer.

anonymous · Answer

Thanks!

danielajohana · Answer

You're welcome!

anonymous · Answer

@DanielaJohana I got -3... but I'm not sure what I did wrong... >.<

danielajohana · Answer

Okay let me try this... give me a moment @potatopeel

danielajohana · Answer

@potatopeel, I got x=0 and x=-1.3333                         (f+g)(-1)
f(x)= 3x^2 -2
g(x)= 4x +2
(3x^2-2 + 4x +2)(-1)
(3x^2 +4x)(-1)
-3x^2 -4x
x(-3x-4)=0
x=0  and   0= -3x-4
                 +4     +4
                 4=-3x
                4/-3=x
                   -1.33333=x