5y-y^2=8

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Solution for 5y-y^2=8 equation:


Simplifying
5y + -1y2 = 8

Solving
5y + -1y2 = 8

Solving for variable 'y'.

Reorder the terms:
-8 + 5y + -1y2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + 5y + -1y2 = 0

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

Divide each side by '-1'.
8 + -5y + y2 = 0

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + -5y + -8 + y2 = 0 + -8

Reorder the terms:
8 + -8 + -5y + y2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -5y + y2 = 0 + -8
-5y + y2 = 0 + -8

Combine like terms: 0 + -8 = -8
-5y + y2 = -8

The y term is -5y.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5y + 6.25 + y2 = -8 + 6.25

Reorder the terms:
6.25 + -5y + y2 = -8 + 6.25

Combine like terms: -8 + 6.25 = -1.75
6.25 + -5y + y2 = -1.75

Factor a perfect square on the left side:
(y + -2.5)(y + -2.5) = -1.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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