2y^2+2=9y

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


Simplifying
2y2 + 2 = 9y

Reorder the terms:
2 + 2y2 = 9y

Solving
2 + 2y2 = 9y

Solving for variable 'y'.

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

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

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

Divide each side by '2'.
1 + -4.5y + y2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -4.5y + -1 + y2 = 0 + -1

Reorder the terms:
1 + -1 + -4.5y + y2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -4.5y + y2 = 0 + -1
-4.5y + y2 = 0 + -1

Combine like terms: 0 + -1 = -1
-4.5y + y2 = -1

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 = -1 + 5.0625

Reorder the terms:
5.0625 + -4.5y + y2 = -1 + 5.0625

Combine like terms: -1 + 5.0625 = 4.0625
5.0625 + -4.5y + y2 = 4.0625

Factor a perfect square on the left side:
(y + -2.25)(y + -2.25) = 4.0625

Calculate the square root of the right side: 2.015564437

Break this problem into two subproblems by setting 
(y + -2.25) equal to 2.015564437 and -2.015564437.

Subproblem 1

y + -2.25 = 2.015564437 Simplifying y + -2.25 = 2.015564437 Reorder the terms: -2.25 + y = 2.015564437 Solving -2.25 + y = 2.015564437 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 = 2.015564437 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + y = 2.015564437 + 2.25 y = 2.015564437 + 2.25 Combine like terms: 2.015564437 + 2.25 = 4.265564437 y = 4.265564437 Simplifying y = 4.265564437

Subproblem 2

y + -2.25 = -2.015564437 Simplifying y + -2.25 = -2.015564437 Reorder the terms: -2.25 + y = -2.015564437 Solving -2.25 + y = -2.015564437 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 = -2.015564437 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + y = -2.015564437 + 2.25 y = -2.015564437 + 2.25 Combine like terms: -2.015564437 + 2.25 = 0.234435563 y = 0.234435563 Simplifying y = 0.234435563

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.265564437, 0.234435563}

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