Question

If f(x) = 4x – 7 and g(x) = 2x + 4, evaluate f(x) + g(x) for x = –3.
A.

–52
B.

–21
C.

–22
D.

–15

Answer 1

Just add the two functions..

Answer 2

yes i get that but could you write out what i have to do please im really sorry for the trouble

Answer 3

Wait, then..

Answer 4

ok

Answer 5

You have two functions, f(x) and g(x)..

Question is : you have to find f(x) + g(x) at x = -3

Answer 6

Now, adding two functions is just similar to the way you add two numbers like 3 + 4 = 7

Answer 7

So:

\[f(x ) + g(x) = 4x - 7 + 2x + 4 \implies ??\]

Answer 8

-12-7+-6+4?
is what i have to do correct

Answer 9

-21

Answer 10

@waterineyes

Answer 11

so f(-3)+g(-3)=-21

Answer 12

@tkhunny

Answer 13

You can add them first and then put the values also... :)

Answer 14

-21 is correct..

Answer 15

Or you can also do like : f(-3) + g(-3).. All are one and the same thing..

Answer 16

ok Thank you very much

Answer 17

tkhunny will you help me with another

Answer 18

If f(x) = 4x – 5 and g(x) = 3 – 2x, find f(x) + g(x)

Answer 19

Why is there still a question?

f(-3) = 4(-3) - 7 = -12 - 7 = -19
g(-3) = 2(-3) + 4 = -6 + 4 = -2
f(-3) + g(-3) = -19 + (-2) = -19 - 2 = -21

OR

h(x) = f(x) + g(x) = 4x – 7 + 2x + 4 = 6x - 3
h(-3) = 6(-3) - 3 = -18 - 3 = -21

If you've other problems, please post a new thread. ALWAYS show your own work.

Answer 20

i hate functions