To find what x is equal to, we need to take the square root of both sides. But, we must note that a square root of a value is both positive and negative. Since the square root of 36 is 6, that means that our equation is:
x + 5 = ±6
That means that x + 5 = 6 or x + 5 = -6
That means that x = 1 or x = -11