Tolong ya kak Dikumpulkan secepatnya trim'S 3 n 4

jawab
fungsi

3.
f(x) = 3/5 ( x+ 4)
f⁻¹(a) = 6 --> f(6) = a
a = 3/5 (6+4)
a = 3/5(10)
a = 6

4>
f(x) = x² -8x + 11
f⁻¹ (5) = a
f(a) = 5
a² - 8a + 11 = 5
a² -8a = 5 -11 
a² -8a = -11
(a - 4)² = -11 + 16
(a - 4) = √5
a= 4 + √5  atau a = 4 - √5

f⁻¹(5) = 4 + √5  atau f⁻¹(5) = 4 - √5