X^2+X^2=85

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Solution for X^2+X^2=85 equation: 


Simplifying
X2 + X2 = 85

Combine like terms: X2 + X2 = 2X2
2X2 = 85

Solving
2X2 = 85

Solving for variable 'X'.

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

Divide each side by '2'.
X2 = 42.5

Simplifying
X2 = 42.5

Take the square root of each side:
X = {-6.519202405, 6.519202405}

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