Y^2-1=8

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Solution for Y^2-1=8 equation: 


Simplifying
Y2 + -1 = 8

Reorder the terms:
-1 + Y2 = 8

Solving
-1 + Y2 = 8

Solving for variable 'Y'.

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

Add '1' to each side of the equation.
-1 + 1 + Y2 = 8 + 1

Combine like terms: -1 + 1 = 0
0 + Y2 = 8 + 1
Y2 = 8 + 1

Combine like terms: 8 + 1 = 9
Y2 = 9

Simplifying
Y2 = 9

Take the square root of each side:
Y = {-3, 3}

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