tolong bantu nomer 7 ya plis..

f(x) = ax + b
f(a) = a² - 3a + 1
maka b = -3a + 1

f(-b) = -ab - 2a - 3
maka b = -2a - 3

-3a + 1 = -2a - 3
a = 4

Sub titusi nilai a = 4 ke     -2a - 3
-2a - 3
= -2(4) - 3
= -8 - 3
= -11

Jadi f(x) = 4x - 11

Invers f adalh

f(x) = 4x - 11
y = 4x - 11
4x = y + 11
  x = (y + 11) / 4

f ⁻¹(x) = (x + 11) / 4