Question

If f(x) = x + 4 and g(x) = 5x - 2, find (g-f)(2).

Answer 1

what is g(x)-f(x) =?

Answer 2

Just plug in 2 in for the place of x in both equations
f(x) = 2+4 =6
g(x) = 10-2 =8
8-6 = 2
Or you can justify by solving g - f
5x-2-x-4
4x-6
4(2)-6
8-6 =
2

Answer 3

If f(x) = x + 4 and g(x) = 5x - 2, find (g + f)(-3). could you help with this one?

Answer 4

Ok so,
Now add:
x + 4+5x - 2
6x+2
Now plug in -3 for x
-18 + 2
-16
Or we can justify by:
Plug in -3 at f(x)
-3+4 = 1
Plug in 3 at g(x)
-15-2 = -17
-17 + 1 = -16
So the answer is -16

Answer 5

ok someone showed me the foil way and i got something differ nt

Answer 6

10. If f(x) = x + 4 and g(x) = 5x - 2, find (gf)(4). and i tried this

Answer 7

Yes this is different because this is multiplication, which you will use the FOIL way :)

Answer 8

Multiply Using FOIL
(x + 4)(5x - 2)
5x^2 -2x +20x -8
Add the similar terms
5x^2 +18x -8
Now plug in 4 as x
5(4)^2 +18(4) -8
80+72-8
182-8 = 174

Answer 9

thanks for the help

Answer 10

If f(x) = x - 1 and g(x) = 2x - 3, find (f - g)(x). this one i got

Answer 11

Did you get an answer?

Answer 12

@dulcab526

Answer 13

yes