y^2-2y-(-99)=0

Solution for y^2-2y-(-99)=0 equation:

Simplifying
y2 + -2y + -1(-99) = 0

Multiply -1 * -99
y2 + -2y + 99 = 0

Reorder the terms:
99 + -2y + y2 = 0

Solving
99 + -2y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-99' to each side of the equation.
99 + -2y + -99 + y2 = 0 + -99

Reorder the terms:
99 + -99 + -2y + y2 = 0 + -99

Combine like terms: 99 + -99 = 0
0 + -2y + y2 = 0 + -99
-2y + y2 = 0 + -99

Combine like terms: 0 + -99 = -99
-2y + y2 = -99

The y term is -2y.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2y + 1 + y2 = -99 + 1

Reorder the terms:
1 + -2y + y2 = -99 + 1

Combine like terms: -99 + 1 = -98
1 + -2y + y2 = -98

Factor a perfect square on the left side:
(y + -1)(y + -1) = -98

Can't calculate square root of the right side.

The solution to this equation could not be determined.