Question

Rút gọn:
C = 3(2 - x)² - 3x(x²- 4)

Answer 1

\(=3\left(x^2-4x+4\right)-3x^3+12x\)

\(=3x^2-12x+12-3x^3+12x\)

\(=-3x^3+3x^2+12\)

Answer 2

`C = 3 . (2-x)^2 - 3x(x^2-4)`

`= 3x^2 - 12x + 12 - 3x^3 + 12x`

`= -3x^3 + 3x^2 + 12`.