Question

Tolong dibntu kak
Smoga bermanfaat bagi saya

Answer 1

Verified answer

1)
f(x) = 5x - 4
f(2a+3) = 5(2a+3) - 4
f(2a+3) = 10a + 15 - 4
f(2a+3) = 10a + 11 (C)

2)
misalkan :
t = 2x - 2 sehingga x = 1/2(t + 2)
f(2x-2) = 8x + 4
f(t) = 8(1/2(t + 2)) + 4
f(t) = 4(t + 2) + 4
f(t) = 4t + 8 + 4
f(t) = 4t + 12
f(x) = 4x + 12
f(-5) = 4(-5) + 12
f(-5) = -20 + 12
f(-5) = -8 (C)

3)
misalkan :
t = 3x - 1 sehingga x = 1/3(t + 1)
f(3x-1) = 6x + 3
f(t) = 6(1/3(t + 1)) + 3
f(t) = 2(t + 1) + 3
f(t) = 2t + 2 + 3
f(t) = 2t + 5
f(x) = 2x + 5
f(-5) = 2(-5) + 5
f(-5) = -10 + 5
f(-5) = -5 (C)

4)
misalkan :
t = x + 1 sehingga x = t - 1
f(x+1) = 2x - 3
f(t) = 2(t - 1) - 3
f(t) = 2t - 2 - 3
f(t) = 2t - 5
f(x) = 2x - 5
f(-8) = 2(-8) - 5
f(-8) = -16 - 5
f(-8) = -21 (A)