21+x^2=28.5

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Solution for 21+x^2=28.5 equation: 


Simplifying
21 + x2 = 28.5

Solving
21 + x2 = 28.5

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + x2 = 28.5 + -21

Combine like terms: 21 + -21 = 0
0 + x2 = 28.5 + -21
x2 = 28.5 + -21

Combine like terms: 28.5 + -21 = 7.5
x2 = 7.5

Simplifying
x2 = 7.5

Take the square root of each side:
x = {-2.738612788, 2.738612788}

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