y^2+2y=5.75

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Solution for y^2+2y=5.75 equation:


Simplifying
y2 + 2y = 5.75

Reorder the terms:
2y + y2 = 5.75

Solving
2y + y2 = 5.75

Solving for variable 'y'.

Reorder the terms:
-5.75 + 2y + y2 = 5.75 + -5.75

Combine like terms: 5.75 + -5.75 = 0.00
-5.75 + 2y + y2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '5.75' to each side of the equation.
-5.75 + 2y + 5.75 + y2 = 0.00 + 5.75

Reorder the terms:
-5.75 + 5.75 + 2y + y2 = 0.00 + 5.75

Combine like terms: -5.75 + 5.75 = 0.00
0.00 + 2y + y2 = 0.00 + 5.75
2y + y2 = 0.00 + 5.75

Combine like terms: 0.00 + 5.75 = 5.75
2y + y2 = 5.75

The y term is 2y.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2y + 1 + y2 = 5.75 + 1

Reorder the terms:
1 + 2y + y2 = 5.75 + 1

Combine like terms: 5.75 + 1 = 6.75
1 + 2y + y2 = 6.75

Factor a perfect square on the left side:
(y + 1)(y + 1) = 6.75

Calculate the square root of the right side: 2.598076211

Break this problem into two subproblems by setting 
(y + 1) equal to 2.598076211 and -2.598076211.

Subproblem 1

y + 1 = 2.598076211 Simplifying y + 1 = 2.598076211 Reorder the terms: 1 + y = 2.598076211 Solving 1 + y = 2.598076211 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = 2.598076211 + -1 Combine like terms: 1 + -1 = 0 0 + y = 2.598076211 + -1 y = 2.598076211 + -1 Combine like terms: 2.598076211 + -1 = 1.598076211 y = 1.598076211 Simplifying y = 1.598076211

Subproblem 2

y + 1 = -2.598076211 Simplifying y + 1 = -2.598076211 Reorder the terms: 1 + y = -2.598076211 Solving 1 + y = -2.598076211 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = -2.598076211 + -1 Combine like terms: 1 + -1 = 0 0 + y = -2.598076211 + -1 y = -2.598076211 + -1 Combine like terms: -2.598076211 + -1 = -3.598076211 y = -3.598076211 Simplifying y = -3.598076211

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.598076211, -3.598076211}

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