Question

Rút gọn
a) (x+1)(3-x)(x-2)²
b) 9x(1-x)+(3x-2)(3x+2)
 

Answer 1

a: (x+1)(3-x)(x-2)²

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

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

\(=-x^4+4x^3-4x^2+2x^3-8x^2+8x+3x^2-12x+12\)

\(=-x^4+6x^3-9x^2-4x+12\)

b: \(9x\left(1-x\right)+\left(3x-2\right)\left(3x+2\right)\)

\(=9x-9x^2+\left(3x\right)^2-4\)

\(=9x-9x^2+9x^2-4=9x-4\)