v^2-4=21

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Solution for v^2-4=21 equation: 


Simplifying
v2 + -4 = 21

Reorder the terms:
-4 + v2 = 21

Solving
-4 + v2 = 21

Solving for variable 'v'.

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

Add '4' to each side of the equation.
-4 + 4 + v2 = 21 + 4

Combine like terms: -4 + 4 = 0
0 + v2 = 21 + 4
v2 = 21 + 4

Combine like terms: 21 + 4 = 25
v2 = 25

Simplifying
v2 = 25

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

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