X^2+4=21

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Solution for X^2+4=21 equation: 


Simplifying
X2 + 4 = 21

Reorder the terms:
4 + X2 = 21

Solving
4 + X2 = 21

Solving for variable 'X'.

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

Add '-4' to each side of the equation.
4 + -4 + X2 = 21 + -4

Combine like terms: 4 + -4 = 0
0 + X2 = 21 + -4
X2 = 21 + -4

Combine like terms: 21 + -4 = 17
X2 = 17

Simplifying
X2 = 17

Take the square root of each side:
X = {-4.123105626, 4.123105626}

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