x^2+9-15=0

Solution for x^2+9-15=0 equation:

Simplifying
x2 + 9 + -15 = 0

Reorder the terms:
9 + -15 + x2 = 0

Combine like terms: 9 + -15 = -6
-6 + x2 = 0

Solving
-6 + x2 = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '6' to each side of the equation.
-6 + 6 + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + x2 = 0 + 6
x2 = 0 + 6

Combine like terms: 0 + 6 = 6
x2 = 6

Simplifying
x2 = 6

Take the square root of each side:
x = {-2.449489743, 2.449489743}