Question

1) x^3-9x=

2) -5a^2-10ab-5b^2=

Answer 1

1) x^3-9x= x(x^2-9)=x(x+3)(x-3)
2) -5a^2-10ab-5b^2= -5(a^2+2ab+b^2)=-5(a+b)^2