u^2-20=-4

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Solution for u^2-20=-4 equation: 


Simplifying
u2 + -20 = -4

Reorder the terms:
-20 + u2 = -4

Solving
-20 + u2 = -4

Solving for variable 'u'.

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

Add '20' to each side of the equation.
-20 + 20 + u2 = -4 + 20

Combine like terms: -20 + 20 = 0
0 + u2 = -4 + 20
u2 = -4 + 20

Combine like terms: -4 + 20 = 16
u2 = 16

Simplifying
u2 = 16

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

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