15. Jika f(3 x^2-3x+2) = 5x + 7 maka f-1(12) = …. (A) 2 (B) 3 (C) 4 (D) 5 E. 6

Question

Matematika Diposting : 2017-12-30 Diupdate : 2021-03-23 ulyakamilia

Pertanyaan

15. Jika f(3 x^2-3x+2) = 5x + 7 maka f-1(12) = ….
(A) 2 (B) 3 (C) 4 (D) 5 E. 6

Answer 1

f(3x² - 3x + 2) = 5x + 7
f^-1 (5x + 7) = 3x² - 3x + 2

f^-1 (12) = ...
5x + 7 = 12
x = 1

f^-1 (12) = 3.1² - 3.1 + 2
f^-1 (12) = 2