-2y^2-5y=-5

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


Simplifying
-2y2 + -5y = -5

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

Solving
-5y + -2y2 = -5

Solving for variable 'y'.

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

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

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

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

Move the constant term to the right:

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

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

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

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

The y term is 2.5y.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5y + 1.5625 + y2 = 2.5 + 1.5625

Reorder the terms:
1.5625 + 2.5y + y2 = 2.5 + 1.5625

Combine like terms: 2.5 + 1.5625 = 4.0625
1.5625 + 2.5y + y2 = 4.0625

Factor a perfect square on the left side:
(y + 1.25)(y + 1.25) = 4.0625

Calculate the square root of the right side: 2.015564437

Break this problem into two subproblems by setting 
(y + 1.25) equal to 2.015564437 and -2.015564437.

Subproblem 1

y + 1.25 = 2.015564437 Simplifying y + 1.25 = 2.015564437 Reorder the terms: 1.25 + y = 2.015564437 Solving 1.25 + y = 2.015564437 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + y = 2.015564437 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + y = 2.015564437 + -1.25 y = 2.015564437 + -1.25 Combine like terms: 2.015564437 + -1.25 = 0.765564437 y = 0.765564437 Simplifying y = 0.765564437

Subproblem 2

y + 1.25 = -2.015564437 Simplifying y + 1.25 = -2.015564437 Reorder the terms: 1.25 + y = -2.015564437 Solving 1.25 + y = -2.015564437 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + y = -2.015564437 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + y = -2.015564437 + -1.25 y = -2.015564437 + -1.25 Combine like terms: -2.015564437 + -1.25 = -3.265564437 y = -3.265564437 Simplifying y = -3.265564437

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.765564437, -3.265564437}

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