x^2+2x^2=255

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Solution for x^2+2x^2=255 equation: 


Simplifying
x2 + 2x2 = 255

Combine like terms: x2 + 2x2 = 3x2
3x2 = 255

Solving
3x2 = 255

Solving for variable 'x'.

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

Divide each side by '3'.
x2 = 85

Simplifying
x2 = 85

Take the square root of each side:
x = {-9.219544457, 9.219544457}

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