Question

[Jeonggukk]

a)(x3 +3x2 -8x-20):(x+2)

b)(4x2 -4x-4):(x+4)

c)(2x3 - 3x2 +x-2):(x+5)

Giúp mình với ạ

Answer 1

[Ngô Chi Lan]

a) \(\left(x^3+3x^2-8x-20\right)\div\left(x+2\right)\)

\(=\left[\left(x^3+2x^2\right)+\left(x^2+2x\right)-\left(10x+20\right)\right]\div\left(x+2\right)\)

\(=\left(x+2\right)\left(x^2+x-10\right)\div\left(x+2\right)\)

\(=x^2+x-10\) \(\left(x\ne-2\right)\)

b,c bn tự đặt chia

Answer 2

[Nguyễn Khánh Phương]

không giúp