[tex] x^{2} +3 x=0
-2 x^{2} -4 x=0

Решение1)  x² + 3x = 0x*(x + 3) = 0x₁ = 0илиx + 3 = 0x₂ = - 32)  - 2x² - 4x = 0-2x*(x + 2) = 0- 2x = 0x₁ = 0или x + 2 = 0x₂ = - 2