y^2+y^2=9y+9

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Solution for y^2+y^2=9y+9 equation:


Simplifying
y2 + y2 = 9y + 9

Combine like terms: y2 + y2 = 2y2
2y2 = 9y + 9

Reorder the terms:
2y2 = 9 + 9y

Solving
2y2 = 9 + 9y

Solving for variable 'y'.

Reorder the terms:
-9 + -9y + 2y2 = 9 + 9y + -9 + -9y

Reorder the terms:
-9 + -9y + 2y2 = 9 + -9 + 9y + -9y

Combine like terms: 9 + -9 = 0
-9 + -9y + 2y2 = 0 + 9y + -9y
-9 + -9y + 2y2 = 9y + -9y

Combine like terms: 9y + -9y = 0
-9 + -9y + 2y2 = 0

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

Divide each side by '2'.
-4.5 + -4.5y + y2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + -4.5y + 4.5 + y2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + -4.5y + y2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + -4.5y + y2 = 0 + 4.5
-4.5y + y2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
-4.5y + y2 = 4.5

The y term is -4.5y.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5y + 5.0625 + y2 = 4.5 + 5.0625

Reorder the terms:
5.0625 + -4.5y + y2 = 4.5 + 5.0625

Combine like terms: 4.5 + 5.0625 = 9.5625
5.0625 + -4.5y + y2 = 9.5625

Factor a perfect square on the left side:
(y + -2.25)(y + -2.25) = 9.5625

Calculate the square root of the right side: 3.092329219

Break this problem into two subproblems by setting 
(y + -2.25) equal to 3.092329219 and -3.092329219.

Subproblem 1

y + -2.25 = 3.092329219 Simplifying y + -2.25 = 3.092329219 Reorder the terms: -2.25 + y = 3.092329219 Solving -2.25 + y = 3.092329219 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + y = 3.092329219 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + y = 3.092329219 + 2.25 y = 3.092329219 + 2.25 Combine like terms: 3.092329219 + 2.25 = 5.342329219 y = 5.342329219 Simplifying y = 5.342329219

Subproblem 2

y + -2.25 = -3.092329219 Simplifying y + -2.25 = -3.092329219 Reorder the terms: -2.25 + y = -3.092329219 Solving -2.25 + y = -3.092329219 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + y = -3.092329219 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + y = -3.092329219 + 2.25 y = -3.092329219 + 2.25 Combine like terms: -3.092329219 + 2.25 = -0.842329219 y = -0.842329219 Simplifying y = -0.842329219

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.342329219, -0.842329219}

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