Question

phân tích thành nhân tử 

a) x³ - 2x² + 2x - 13

b) x²y + xy + x +1

c) ax + by + ay + bx

d) x² - ( a+b)x + ab

hộ ạ , cảm ơn

Answer 1

Answer 2

b) Ta có: \(x^2y+xy+x+1\)

\(=xy\left(x+1\right)+\left(x+1\right)\)

\(=\left(x+1\right)\left(xy+1\right)\)

c) Ta có:  \(ax+by+ay+bx\)

\(=a\left(x+y\right)+b\left(x+y\right)\)

\(=\left(x+y\right)\left(a+b\right)\)

 

Answer 3

d) Ta có: \(x^2-\left(a+b\right)x+ab\)

\(=x^2-ax-bx+ab\)

\(=x\left(x-a\right)-b\left(x-a\right)\)

\(=\left(x-a\right)\left(x-b\right)\)