y^2-91=0

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Solution for y^2-91=0 equation: 


Simplifying
y2 + -91 = 0

Reorder the terms:
-91 + y2 = 0

Solving
-91 + y2 = 0

Solving for variable 'y'.

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

Add '91' to each side of the equation.
-91 + 91 + y2 = 0 + 91

Combine like terms: -91 + 91 = 0
0 + y2 = 0 + 91
y2 = 0 + 91

Combine like terms: 0 + 91 = 91
y2 = 91

Simplifying
y2 = 91

Take the square root of each side:
y = {-9.539392014, 9.539392014}

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