User blog comment:Sparklyplatypus/"Are You Smarter Than an Xth Grader?"/@comment-3126828-20111115040847/@comment-4041072-20111115121555

The answer is 2 and 18. I just started 7th grade, so this all very new to me. So.....Um..

x2=20x-36 ==> x2-20x+36=0 Factor out and you get:

(x-2)(x-18)=0

thus, x=2, and x=18