3x^2=18+x^2

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Solution for 3x^2=18+x^2 equation: 


Simplifying
3x2 = 18 + x2

Solving
3x2 = 18 + x2

Solving for variable 'x'.

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

Add '-1x2' to each side of the equation.
3x2 + -1x2 = 18 + x2 + -1x2

Combine like terms: 3x2 + -1x2 = 2x2
2x2 = 18 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
2x2 = 18 + 0
2x2 = 18

Divide each side by '2'.
x2 = 9

Simplifying
x2 = 9

Take the square root of each side:
x = {-3, 3}

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