x2+8x+7=0
x2-4x-5=0
x2+7x+10=0
x2+3x-4=0
3x2 + 6x=0
x2 + 6x =0
x2+12x+20=0
x2+20x+100=0
(x+7)(x+1)=0
(x+1)(x-5)=0
(x+2)(x+10)=0
(x+4)(x-1)=0
x(x+6)=0
(x+10)(x+10)=0
(x+5)(x+2)=0
3x(x+2)=0
