Question

Jika f(x) = x - 2 maka 2f(x2) - 3 [f(x)]2 - f(x) = a.x2 - 11x - 14 b. -x2 + 11x -14 c. x2-11x-14 d. x2-11x+14 e. -x2 -11x + 14

Answer 1

Jawab  B
f(x) = x - 2
2 f(x²) -  3f(x)²  - f(x)= ...
= 2 (x² -2) - 3 (x-2)² - (x -2)
= 2x² -4  - 3(x² - 4x + 4) - x + 2
= 2x² - 4 - 3x² + 12x  - 12 - x + 2
= - x² + 11x - 14