Question

solve x^2 -x -12=0

Answer 1

x=1 or x= 12?

Answer 2

\[x^2-x-12=0\]\[x^2-4x+3x-12=0\]So it won't be x=1 or x=12..

Answer 3

you can always check your answers
x = 1
1^2 -1 -12 != 0
x=12
12^2 - 12 -12 = 144-24 = 120 != 0

Answer 4

Give a try... :)