Question

3x в кубе -9x                           

-5a-10ab-5b в квадрате

 

 

Answer 1

1. $3x^3-9x = 3x(x^2-3) = 3x(x-sqrt{3})(x+sqrt{3})$

2. $-5a-10ab-5b^2 = -5a-5ab-5ab-5b^2 = -5(a+ab+ab+b^2) = -5(a(1+b)+b(a+b))$