4y-9=y^2+11

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Solution for 4y-9=y^2+11 equation:


Simplifying
4y + -9 = y2 + 11

Reorder the terms:
-9 + 4y = y2 + 11

Reorder the terms:
-9 + 4y = 11 + y2

Solving
-9 + 4y = 11 + y2

Solving for variable 'y'.

Reorder the terms:
-9 + -11 + 4y + -1y2 = 11 + y2 + -11 + -1y2

Combine like terms: -9 + -11 = -20
-20 + 4y + -1y2 = 11 + y2 + -11 + -1y2

Reorder the terms:
-20 + 4y + -1y2 = 11 + -11 + y2 + -1y2

Combine like terms: 11 + -11 = 0
-20 + 4y + -1y2 = 0 + y2 + -1y2
-20 + 4y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
-20 + 4y + -1y2 = 0

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

Divide each side by '-1'.
20 + -4y + y2 = 0

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + -4y + -20 + y2 = 0 + -20

Reorder the terms:
20 + -20 + -4y + y2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -4y + y2 = 0 + -20
-4y + y2 = 0 + -20

Combine like terms: 0 + -20 = -20
-4y + y2 = -20

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 = -20 + 4

Reorder the terms:
4 + -4y + y2 = -20 + 4

Combine like terms: -20 + 4 = -16
4 + -4y + y2 = -16

Factor a perfect square on the left side:
(y + -2)(y + -2) = -16

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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