Question

I've got two of these kinds of problems and no clue how to do them, help please!

Answer 1

Hello,

$3x^3+2x^2-3x-2=0\\ 3x^3-3x+2x^2-2=0\\ 3x(x^2-1)+2(x^2-1)=0\\ (x^2-1)(3x+2)=0\\ (x-1)(x+1)(3x+2)=0\\ Sol=\{- \dfrac{2}{3}, -1,1 \}$

Answer 2

Doesn't X equal 0 because anything times 0 equals 0