It is: (x+5)(x-8) when factored
x2 - 3x - 40 = (x - 8) (x + 5)
x = ? 42 = x squared minus x
4x + 20
By factoring I get x-3 divided by x+3
-22 - -22
Factor out -2: -2(x squared +11x-20). This is fully factored.
xsquared minus x minus 72
x - 2
(x - 5)(x + 4)
(x−6)(x+5)
Sin squared, cos squared...you removed the x in the equation.