x²+5x-14=0
x²+7x-2x-14=0
x(x+7)-2(x+7)=0
(x+7)(x-2)=0
x=-7
x=2
x²-14x+40=0
x²-4x-10x+40=0
x(x-4)-10(x-4)=0
(x-4)(x-10)=0
x=4
x=10
12m²+m-6=0
12m²+9m-8m-6=0
3m(4m+3)-2(4m+3)=0
(4m+3)(3m-2)=0
m=-3/4
m=2/3
