x^2+9=90

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Solution for x^2+9=90 equation: 


Simplifying
x2 + 9 = 90

Reorder the terms:
9 + x2 = 90

Solving
9 + x2 = 90

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + x2 = 90 + -9

Combine like terms: 9 + -9 = 0
0 + x2 = 90 + -9
x2 = 90 + -9

Combine like terms: 90 + -9 = 81
x2 = 81

Simplifying
x2 = 81

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

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