Question

The difference of the square of a number and 18 is equal to 3 times that number. Find the positive solution.

Answer 1

Answer: x=6 or x=-3

Explanation:

x^2-18=3x

x^2-3x-18=0

(x-6)*(x+3)=0

x-6=0 x+3=0

x=6 x=-3