Question

4.
maka
Jika f(x) = 2x - 1 dan g(x) = 5x - x
(fog)(-1) = ....
A.-24
B. - 13
C. - 9
D. -6
E. -4


5.
Jika (fog)(x) = 6x - 3 dan f(x) = 2x + 5 maka
g(x) = ...
A. 48–8
B. 3x - 4
C. 3x + 4
D. 2x - 4
E. 2x + 4

Tolong di jawab ya​

Answer 1

Jawaban:

4.)

(f o g)(x) = f(g(x))

f(x) = 2x - 1

f(g(x)) = 2(g(x)) - 1

f(g(x)) = 2(5x - 1) - 1

= 10x - 2 - 1

= 10x - 3

(f o g)(-1) = 10(-1) - 3

= -10 -3 = -13

5.)

(f o g)(x) = 6x - 3

(f o g)(x) = f(g(x))

f(x) = 2x + 5

f(g(x)) = 2(g(x)) + 5

2(g(x)) + 5 = 6x - 3

2(g(x)) = 6x - 3 - 5

2(g(x)) = 6x - 8

g(x) = (6x - 8) / 2

g(x) = 3x - 4