-x^2+15=0

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

Simplifying
-1x2 + 15 = 0

Reorder the terms:
15 + -1x2 = 0

Solving
15 + -1x2 = 0

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + -1x2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -1x2 = 0 + -15
-1x2 = 0 + -15

Combine like terms: 0 + -15 = -15
-1x2 = -15

Divide each side by '-1'.
x2 = 15

Simplifying
x2 = 15

Take the square root of each side:
x = {-3.872983346, 3.872983346}