c^2-4=21

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Solution for c^2-4=21 equation: 


Simplifying
c2 + -4 = 21

Reorder the terms:
-4 + c2 = 21

Solving
-4 + c2 = 21

Solving for variable 'c'.

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

Add '4' to each side of the equation.
-4 + 4 + c2 = 21 + 4

Combine like terms: -4 + 4 = 0
0 + c2 = 21 + 4
c2 = 21 + 4

Combine like terms: 21 + 4 = 25
c2 = 25

Simplifying
c2 = 25

Take the square root of each side:
c = {-5, 5}

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