x^2+x^2+36=400

Solution for x^2+x^2+36=400 equation:

Simplifying
x2 + x2 + 36 = 400

Reorder the terms:
36 + x2 + x2 = 400

Combine like terms: x2 + x2 = 2x2
36 + 2x2 = 400

Solving
36 + 2x2 = 400

Solving for variable 'x'.

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

Add '-36' to each side of the equation.
36 + -36 + 2x2 = 400 + -36

Combine like terms: 36 + -36 = 0
0 + 2x2 = 400 + -36
2x2 = 400 + -36

Combine like terms: 400 + -36 = 364
2x2 = 364

Divide each side by '2'.
x2 = 182

Simplifying
x2 = 182

Take the square root of each side:
x = {-13.490737563, 13.490737563}