Question

solve the inequality x^2-x-12>0

Answer 1

x-12>0
add 12 to both sides
x>12

Answer 2

Got it @dianaeshun

Answer 3

x^2-x-12 > 0
treat as an equation and find nullifying X
x^2-x-12 = 0
factor or solve using a quadratic eqaution:
x=-3, x=4
since x^2 is a positive, it's a "smiling" parabola (positive)
and since the problem asked for everything bigger than 0
the answer is x<-3 OR x>4