2y^2-8y=-5

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Solution for 2y^2-8y=-5 equation:


Simplifying
2y2 + -8y = -5

Reorder the terms:
-8y + 2y2 = -5

Solving
-8y + 2y2 = -5

Solving for variable 'y'.

Reorder the terms:
5 + -8y + 2y2 = -5 + 5

Combine like terms: -5 + 5 = 0
5 + -8y + 2y2 = 0

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

Divide each side by '2'.
2.5 + -4y + y2 = 0

Move the constant term to the right:

Add '-2.5' to each side of the equation.
2.5 + -4y + -2.5 + y2 = 0 + -2.5

Reorder the terms:
2.5 + -2.5 + -4y + y2 = 0 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + -4y + y2 = 0 + -2.5
-4y + y2 = 0 + -2.5

Combine like terms: 0 + -2.5 = -2.5
-4y + y2 = -2.5

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 = -2.5 + 4

Reorder the terms:
4 + -4y + y2 = -2.5 + 4

Combine like terms: -2.5 + 4 = 1.5
4 + -4y + y2 = 1.5

Factor a perfect square on the left side:
(y + -2)(y + -2) = 1.5

Calculate the square root of the right side: 1.224744871

Break this problem into two subproblems by setting 
(y + -2) equal to 1.224744871 and -1.224744871.

Subproblem 1

y + -2 = 1.224744871 Simplifying y + -2 = 1.224744871 Reorder the terms: -2 + y = 1.224744871 Solving -2 + y = 1.224744871 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = 1.224744871 + 2 Combine like terms: -2 + 2 = 0 0 + y = 1.224744871 + 2 y = 1.224744871 + 2 Combine like terms: 1.224744871 + 2 = 3.224744871 y = 3.224744871 Simplifying y = 3.224744871

Subproblem 2

y + -2 = -1.224744871 Simplifying y + -2 = -1.224744871 Reorder the terms: -2 + y = -1.224744871 Solving -2 + y = -1.224744871 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = -1.224744871 + 2 Combine like terms: -2 + 2 = 0 0 + y = -1.224744871 + 2 y = -1.224744871 + 2 Combine like terms: -1.224744871 + 2 = 0.775255129 y = 0.775255129 Simplifying y = 0.775255129

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.224744871, 0.775255129}

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