C^2+21=85

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Solution for C^2+21=85 equation: 


Simplifying
C2 + 21 = 85

Reorder the terms:
21 + C2 = 85

Solving
21 + C2 = 85

Solving for variable 'C'.

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

Add '-21' to each side of the equation.
21 + -21 + C2 = 85 + -21

Combine like terms: 21 + -21 = 0
0 + C2 = 85 + -21
C2 = 85 + -21

Combine like terms: 85 + -21 = 64
C2 = 64

Simplifying
C2 = 64

Take the square root of each side:
C = {-8, 8}

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