Question

x的二次方(x+1)-y(xy+x) 分解因式

Answer 1

x^2(x+1)-y(xy+x)

=x^2(x+1)-xy(y+1)

=x((x(x+1)-y(y+1))

=x(x^2+x-y^2-y)

=x((x-y)(x+y)+(x-y))

=x(x-y)(x+y+1)