(-x-6)(x-7)
-x2 + x + 42= -x2 + 7x - 6x + 42= 7x - x2 + 42 - 6x= x(7 - x) + 6(7 - x)= (7 - x)(x + 6)
x3 + 13x2 + 42x = x(x2 + 13x + 42) = x(x2 + 6x + 7x + 42) = x[x(x + 6) + 7(x + 6)] = x(x + 7)(x + 6)
-x2 + x + 42 = -[x2 - x - 42] = -[x2 - 7x + 6x - 42] = -[x*(x - 7) + 6*(x - 7)] = -(x - 7)*(x + 6)
(x + 7)(x - 6)
x2 + 12x + 27 = (x + 9)(x + 3)
-x2 + 2x + 48 = (x +6)(8 - x)
(x + 4)(x + 1)
= -(x - 7)(x + 6)
X2 -11x +10=(x - 1 )(x - 10)
x2 + 4x - 32 = (x + 8)*(x - 4)
-x2 + 2x + 48 = (-x - 6)(x - 8)
x2+12x+28Improved Answer:--x2+12x+28 = (-x+14)(x+2) when factored