y^2-21=0

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Solution for y^2-21=0 equation: 


Simplifying
y2 + -21 = 0

Reorder the terms:
-21 + y2 = 0

Solving
-21 + y2 = 0

Solving for variable 'y'.

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

Add '21' to each side of the equation.
-21 + 21 + y2 = 0 + 21

Combine like terms: -21 + 21 = 0
0 + y2 = 0 + 21
y2 = 0 + 21

Combine like terms: 0 + 21 = 21
y2 = 21

Simplifying
y2 = 21

Take the square root of each side:
y = {-4.582575695, 4.582575695}

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