4y-y^2=27

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Solution for 4y-y^2=27 equation:


Simplifying
4y + -1y2 = 27

Solving
4y + -1y2 = 27

Solving for variable 'y'.

Reorder the terms:
-27 + 4y + -1y2 = 27 + -27

Combine like terms: 27 + -27 = 0
-27 + 4y + -1y2 = 0

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

Divide each side by '-1'.
27 + -4y + y2 = 0

Move the constant term to the right:

Add '-27' to each side of the equation.
27 + -4y + -27 + y2 = 0 + -27

Reorder the terms:
27 + -27 + -4y + y2 = 0 + -27

Combine like terms: 27 + -27 = 0
0 + -4y + y2 = 0 + -27
-4y + y2 = 0 + -27

Combine like terms: 0 + -27 = -27
-4y + y2 = -27

The y term is -4y.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4y + 4 + y2 = -27 + 4

Reorder the terms:
4 + -4y + y2 = -27 + 4

Combine like terms: -27 + 4 = -23
4 + -4y + y2 = -23

Factor a perfect square on the left side:
(y + -2)(y + -2) = -23

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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