Question

Is this correct?




f(x)=5x+5 and g(x)=6x+1
then what is (f+g)(−8))

5(-8)+5
6(-8)+1

(-35)(-47)

=1645

Answer 1

(f+g)(x) or f(x) +g(x) is the sum of those two functions
f(x) = 5x+5 and g(x) = 6x-1
so f(x) + g(x) would look like this
5x+5+6x-1
combine like terms and we'll get
5x+6x+5-1
11x+4
now we are given that x = -8 so we plug that into the equation
11(-8)+4=-88+4==-84

Answer 2

wait I made a typo x( sorry it's almost 4 let me redo this before I go to bed

Answer 3

if we had something like (fg)(x) or f(x)g(x) that's multiplication
so we will have something like
(5x+5)(6x+1) so when x = -8
(5(-8)+5)(6(-8)+1)
(-40+5)(-48+1)
(-35)(-47)=1645

Answer 4

but your question is asking for the sum
(f+g)(x) or f(x) +g(x) is the sum of those two functions f(x) = 5x+5 and g(x) = 6x+1
so f(x) + g(x) would look like this 5x+5+6x+1

Answer 5

11x+6
so when x = -8
we have
11(-8)+6=
-88+6 = -82

Answer 6

thank you