решить уравнения
x^2−20x+36=0



x^2-10x-56=0

x^2-20x+36=0x^2-2x-18x+36=0x(x-2)-18(x-2)=0(x-2)(x-18)=0x-2=0 x-18=0x=2 x=18x^2-10x-56=0x^2+4x-14x-56=0x(x+4)-14(x+4)=0(x+4)(x-14)=0x+4=0 x-14=0x=-4 x=14