SOAL1. Jika dik (f(x 3) = x+4 maka (-5)​

Jawaban:

f(x) = 3x + 4

g(x) = x – 4/3

(fog) (x) (didalam f(x) ada g(x))

= 3x + 4

= 3(x – 4/3) + 4

= 3x – 12/3 + 4

= 3x – 4 + 4

= 3x

x = 0/3

x = 0

(gof) (x) (didalam g(x) ada f(x))

= x – 4/3

= (3x + 4) – 4/3

= 3x + 4 – 4/3

= 3x + 4/1 – 4/3

= 3x + 12-4/3

= 3x + 8/3

3x = – 8/3

x = -8/3 / 3

x = -8/3 / 3/1

x = -8/3 × 1/3

x = -8/9

x = -0,88