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Simplifying
x2 + x2 + 16 = 400
Reorder the terms:
16 + x2 + x2 = 400
Combine like terms: x2 + x2 = 2x2
16 + 2x2 = 400
Solving
16 + 2x2 = 400
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-16' to each side of the equation.
16 + -16 + 2x2 = 400 + -16
Combine like terms: 16 + -16 = 0
0 + 2x2 = 400 + -16
2x2 = 400 + -16
Combine like terms: 400 + -16 = 384
2x2 = 384
Divide each side by '2'.
x2 = 192
Simplifying
x2 = 192
Take the square root of each side:
x = {-13.856406461, 13.856406461}
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