y*y+1=81

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Solution for y*y+1=81 equation: 


Simplifying
y * y + 1 = 81

Multiply y * y
y2 + 1 = 81

Reorder the terms:
1 + y2 = 81

Solving
1 + y2 = 81

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 = 81 + -1

Combine like terms: 1 + -1 = 0
0 + y2 = 81 + -1
y2 = 81 + -1

Combine like terms: 81 + -1 = 80
y2 = 80

Simplifying
y2 = 80

Take the square root of each side:
y = {-8.94427191, 8.94427191}

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