X*X+8=28

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Solution for X*X+8=28 equation: 


Simplifying
X * X + 8 = 28

Multiply X * X
X2 + 8 = 28

Reorder the terms:
8 + X2 = 28

Solving
8 + X2 = 28

Solving for variable 'X'.

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

Add '-8' to each side of the equation.
8 + -8 + X2 = 28 + -8

Combine like terms: 8 + -8 = 0
0 + X2 = 28 + -8
X2 = 28 + -8

Combine like terms: 28 + -8 = 20
X2 = 20

Simplifying
X2 = 20

Take the square root of each side:
X = {-4.472135955, 4.472135955}

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