Question

Please help for medal- its extra credit.
Let f(x) = -5x - 4 and g(x) = 6x - 7. Find f(x) + g(x)
A. x - 11
B. -11x - 11
C. x + 3
D. -11x = 3b

Answer 1

(-5+6)x=?
-4-7=?

Answer 2

\[\Large {\color{red}{f(x) = -5x-4}}\]
\[\Large {\color{blue}{g(x) = 6x-7}}\]

--------------------------------

\[\Large {\color{red}{f(x)}} + {\color{blue}{g(x)}} = ({\color{red}{-5x-4}})+({\color{blue}{6x-7}})\]

\[\Large f(x) + g(x) = -5x-4 + 6x - 7\]

\[\Large f(x) + g(x) = ???\]

Answer 3

x-11

Answer 4

correct

Answer 5

Can you help with another one? I dont understand the whole domain part...
Let f(x) = 3x + 2 and g(x) =7x + 6. Find f ·g and its domain.

A.
6x2 + 4x + 42; all real numbers

B.
21x2 + 32x + 12; all real numbers

C.
21x2 +32x + 12; all real numbers except x = -6/7

D.
6x2 + 4x + 42; all real numbers except x = -2/3
I know it's 21x^2+32x +12

Answer 6

@jim_thompson5910

Answer 7

f * g means f(x) times g(x)

so you have to expand out (3x+2)*(7x+6)

you can use the FOIL rule or a table like this one