-y^2+9y-36=0

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Solution for -y^2+9y-36=0 equation:


Simplifying
-1y2 + 9y + -36 = 0

Reorder the terms:
-36 + 9y + -1y2 = 0

Solving
-36 + 9y + -1y2 = 0

Solving for variable 'y'.

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

Divide each side by '-1'.
36 + -9y + y2 = 0

Move the constant term to the right:

Add '-36' to each side of the equation.
36 + -9y + -36 + y2 = 0 + -36

Reorder the terms:
36 + -36 + -9y + y2 = 0 + -36

Combine like terms: 36 + -36 = 0
0 + -9y + y2 = 0 + -36
-9y + y2 = 0 + -36

Combine like terms: 0 + -36 = -36
-9y + y2 = -36

The y term is -9y.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9y + 20.25 + y2 = -36 + 20.25

Reorder the terms:
20.25 + -9y + y2 = -36 + 20.25

Combine like terms: -36 + 20.25 = -15.75
20.25 + -9y + y2 = -15.75

Factor a perfect square on the left side:
(y + -4.5)(y + -4.5) = -15.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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