k^2-21=-5

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Solution for k^2-21=-5 equation: 


Simplifying
k2 + -21 = -5

Reorder the terms:
-21 + k2 = -5

Solving
-21 + k2 = -5

Solving for variable 'k'.

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

Add '21' to each side of the equation.
-21 + 21 + k2 = -5 + 21

Combine like terms: -21 + 21 = 0
0 + k2 = -5 + 21
k2 = -5 + 21

Combine like terms: -5 + 21 = 16
k2 = 16

Simplifying
k2 = 16

Take the square root of each side:
k = {-4, 4}

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