Question

Xin mọi người giúp đỡ

Answer 1

a: =x(x-3)(x+3)

c: =(x-3-y)(x-3+y)

Answer 2

a)\(x^2-9x=x\left(x-9\right)\)

b)\(x\left(x-y\right)+3\left(x-y\right)=\left(x-y\right)\left(x+3\right)\)

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

d)\(\left(x+y\right)\left(3-x\right)\)