Question

разложите на множители
а)x^3-9x=
б)-5a^2-10ab-5b^2=

Answer 1

$x^3-9x \to x(x^2-9) \to x(x^2-3^2) \to x(x-3)(x+3) \\ -5a^2-10ab-5a^2 \to -(5a^2+10ab+5b^2) \to -5(a^2+2ab+5b^2) \to -5(a+b)^2$

Answer 2

a)x*(x^2-9)=x*(x^2-3^2)=х*(х-3)*(х+3)
б) -5* (а^2+2аb+b^2)=-5*(a+b)^2