Question 41152

x^2 – 13x = (-36)
x^2 – 13x + 36 = 0
( x – 4 ) ( x – 9 ) = 0
x – 4 = 0
x = 4
And
x – 9 = 0
x = 9
so 4 and 9 are the solutions of this quadratic equation.