It is a quadratic expression which can't be factored because its discriminant is less than zero
x2 + 5x - 120 can not be factored.
x2 + 5x + 6 = (x + 2)(x + 3)
2x + 5x = 7x
x2 - 5x + 6 = (x - 2)(x - 3)
(3x - 5x) + (x2 - 6x2) = -2x -5x2 = -x(2 + 5x)
x2 + 5x + 3 = 9 x2 + 5x - 6 = 0 (x + 6)(x - 1) = 0 x = -6 or x = 1
x2+5x+6 = (x+2)(x+3)
5x+x >100
5(x2 + x + 1)
x2+5x-14 = (x+7)(x-2) when factored
x2 + 5x = 60 x2 + 5x + 25/4 = 60 + 25 / 4 (x + 5/2)2 = 265/4 x + 5/2 = (265/4)1/2 x = -5/2 ± √265 / 2 x = -(5 ± √265) / 2
x2+5x+6 = (x+2)(x+3) when factored because 2 and 3 are factors of 6