2x^2+x^2=243

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Solution for 2x^2+x^2=243 equation: 


Simplifying
2x2 + x2 = 243

Combine like terms: 2x2 + x2 = 3x2
3x2 = 243

Solving
3x2 = 243

Solving for variable 'x'.

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

Divide each side by '3'.
x2 = 81

Simplifying
x2 = 81

Take the square root of each side:
x = {-9, 9}

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