y^2-2y=-100

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Solution for y^2-2y=-100 equation:


Simplifying
y2 + -2y = -100

Reorder the terms:
-2y + y2 = -100

Solving
-2y + y2 = -100

Solving for variable 'y'.

Reorder the terms:
100 + -2y + y2 = -100 + 100

Combine like terms: -100 + 100 = 0
100 + -2y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-100' to each side of the equation.
100 + -2y + -100 + y2 = 0 + -100

Reorder the terms:
100 + -100 + -2y + y2 = 0 + -100

Combine like terms: 100 + -100 = 0
0 + -2y + y2 = 0 + -100
-2y + y2 = 0 + -100

Combine like terms: 0 + -100 = -100
-2y + y2 = -100

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 = -100 + 1

Reorder the terms:
1 + -2y + y2 = -100 + 1

Combine like terms: -100 + 1 = -99
1 + -2y + y2 = -99

Factor a perfect square on the left side:
(y + -1)(y + -1) = -99

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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