y^2+2y-13.5=0

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Solution for y^2+2y-13.5=0 equation:


Simplifying
y2 + 2y + -13.5 = 0

Reorder the terms:
-13.5 + 2y + y2 = 0

Solving
-13.5 + 2y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '13.5' to each side of the equation.
-13.5 + 2y + 13.5 + y2 = 0 + 13.5

Reorder the terms:
-13.5 + 13.5 + 2y + y2 = 0 + 13.5

Combine like terms: -13.5 + 13.5 = 0.0
0.0 + 2y + y2 = 0 + 13.5
2y + y2 = 0 + 13.5

Combine like terms: 0 + 13.5 = 13.5
2y + y2 = 13.5

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 = 13.5 + 1

Reorder the terms:
1 + 2y + y2 = 13.5 + 1

Combine like terms: 13.5 + 1 = 14.5
1 + 2y + y2 = 14.5

Factor a perfect square on the left side:
(y + 1)(y + 1) = 14.5

Calculate the square root of the right side: 3.807886553

Break this problem into two subproblems by setting 
(y + 1) equal to 3.807886553 and -3.807886553.

Subproblem 1

y + 1 = 3.807886553 Simplifying y + 1 = 3.807886553 Reorder the terms: 1 + y = 3.807886553 Solving 1 + y = 3.807886553 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 = 3.807886553 + -1 Combine like terms: 1 + -1 = 0 0 + y = 3.807886553 + -1 y = 3.807886553 + -1 Combine like terms: 3.807886553 + -1 = 2.807886553 y = 2.807886553 Simplifying y = 2.807886553

Subproblem 2

y + 1 = -3.807886553 Simplifying y + 1 = -3.807886553 Reorder the terms: 1 + y = -3.807886553 Solving 1 + y = -3.807886553 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 = -3.807886553 + -1 Combine like terms: 1 + -1 = 0 0 + y = -3.807886553 + -1 y = -3.807886553 + -1 Combine like terms: -3.807886553 + -1 = -4.807886553 y = -4.807886553 Simplifying y = -4.807886553

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.807886553, -4.807886553}

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