-y^2-4=-y

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Solution for -y^2-4=-y equation:


Simplifying
-1y2 + -4 = -1y

Reorder the terms:
-4 + -1y2 = -1y

Solving
-4 + -1y2 = -1y

Solving for variable 'y'.

Reorder the terms:
-4 + y + -1y2 = -1y + y

Combine like terms: -1y + y = 0
-4 + y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
4 + -1y + y2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -1y + -4 + y2 = 0 + -4

Reorder the terms:
4 + -4 + -1y + y2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -1y + y2 = 0 + -4
-1y + y2 = 0 + -4

Combine like terms: 0 + -4 = -4
-1y + y2 = -4

The y term is y.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1y + 0.25 + y2 = -4 + 0.25

Reorder the terms:
0.25 + -1y + y2 = -4 + 0.25

Combine like terms: -4 + 0.25 = -3.75
0.25 + -1y + y2 = -3.75

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = -3.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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