Question

a) 4 ( 2-x) ² + xy -2y
b) x (x+y)² -y (x+y)-y (x+y)²

Answer 1

a) \(4\left(2-x\right)^2+xy-2y\)

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

\(=\left(x-2\right)\left[4\left(x-2\right)+y\right]\)

\(=\left(x-2\right)\left(4x-8+y\right)\)

b) \(x\left(x+y\right)^2-y\left(x+y\right)-y\left(x+y\right)^2\)

\(=\left(x+y\right)\left[x\left(x+y\right)-y-y\left(x+y\right)\right]\)

\(=\left(x+y\right)\left(x^2+xy-y-xy-y^2\right)\)

\(=\left(x+y\right)\left(x^2-y-y^2\right)\)

P/s: Ko chắc