y^2-84=0

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Solution for y^2-84=0 equation: 


Simplifying
y2 + -84 = 0

Reorder the terms:
-84 + y2 = 0

Solving
-84 + y2 = 0

Solving for variable 'y'.

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

Add '84' to each side of the equation.
-84 + 84 + y2 = 0 + 84

Combine like terms: -84 + 84 = 0
0 + y2 = 0 + 84
y2 = 0 + 84

Combine like terms: 0 + 84 = 84
y2 = 84

Simplifying
y2 = 84

Take the square root of each side:
y = {-9.16515139, 9.16515139}

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