Question

1. diketahui f(x) = 4x+b dan g(x) = 2x-7
tentukan f(x) - g(x) dan f(x) x g(x)

2. diketahui f(x)2x + 3 dan g(x) = 3x^+4
tentukan (f o g) (x) dan (g o f) (x)

tolong yaaa...

Answer 1

F(x)-g(x) :
= 4x+6 - 2x-7
=(4x-2x) + 6 - 7
= 2x - 1
f(x) x g(x)
= (4x + 6)(2x - 7)
= 8x² - 28x + 12x - 42
= 8x² - 16x - 42  <=>  4x² - 8x - 21

Answer 2

F(x)-g(x)=4x+b-2x-7=2x+b-7

f(x)xg(x)=(4x+b)x(2×-7)=8×kuadrat-28×+2×b-7b

(fog)(×)=2(3×kuadrat+4)+3
=6×kuadrat+11

(gof)(×)= 3(2×+3)kuadrat+4=12×kuadrat+36×+27+4=12×kuadrat+36x+31