Question

решите уравнения 3х^2+15х=0
-2х^2-4х=0

Answer 1

1) 3x(x+5)=0; X+5=0; X=-5; 3x=0; x=0; 2) -2x(x+2)=0; X=-2 И X=0

Answer 2

$3 x^{2} +15x=0/:3\\ x^{2} +5x=0\\x(x+5)=0\\x=0\\x+5=0\\x=-5\\\\-2 x^{2} -4x=0/*(-1)\\2 x^{2} +4x=0/:2\\ x^{2} +2x=0\\x(x+2)=0\\x=0\\x+2=0\\x=-2$