Question

factorise x sq minus x minus 12

Answer 1

x^2 - x - 12
= x^2 - 4x +3x -12
= x(x-4) + 3(x-4)
= (x+3) (x-4)
therefore x = 4 , -3

Answer 2

x² - x - 12
(x² -4x)+(3x-12)
x(x-4)+ 3(x-4)
(x+3)(x-4)