Matematika fungsi, no 14,15,16 mohon bantuannya ya,secepatnya dengan jawaban rinci agar bisa dipahami terima kasih.

Fungsi Invers

Cara cepat :

f(x) = (ax + b)/(cx + d)

maka

f^-1 (x) = (-dx + b)/(cx – a)

#14

f(x) = (x – 2)/(x + 4)

f^-1 (x) = (-4x – 2)/(x – 1)

f^-1 (x) = (4x + 2)/(1 – x) dan x ≠ 1

#15

f(x) = (2x – 1)/(3x + 4)

f^-1 (x) = (-4x – 1)/(3x – 2)

f^-1 (1) = (-4.1 – 1)/(3.1 – 2)

f^-1 (1) = -5

#16

f(x) = y = 3/7 (4x + 5)

7y = 3(4x + 5)

7y = 12x + 15

x = (7y – 15)/12

f^-1 (p) = 4

(7p – 15)/12 = 4

7p – 15 = 48

7p = 48 + 15

p = 9