Выделить полный квадрат и разложить на множители многочлен:x ^2 10x

X - 10x - 11 = (x - 5) - 36 = (x - 5) - 6 = (x - 5 - 6)(x - 5 + 6) =
= (x - 11)(x + 1)

x + 4y = (x + 2y) - 4xy =(x + 2y) - (2xy) =(x + 2y - 2xy)(x + 2y +2xy)=
= (x - 2xy + 2y)(x + 2xy + 2y)

x - 4x - 12 = (x - 2) - 16 = (x - 2) - 4 = (x - 2 - 4)(x - 2 + 4) = (x - 6)(x + 2)