11y^2-80y-218=0

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Solution for 11y^2-80y-218=0 equation:


Simplifying
11y2 + -80y + -218 = 0

Reorder the terms:
-218 + -80y + 11y2 = 0

Solving
-218 + -80y + 11y2 = 0

Solving for variable 'y'.

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

Divide each side by '11'.
-19.81818182 + -7.272727273y + y2 = 0

Move the constant term to the right:

Add '19.81818182' to each side of the equation.
-19.81818182 + -7.272727273y + 19.81818182 + y2 = 0 + 19.81818182

Reorder the terms:
-19.81818182 + 19.81818182 + -7.272727273y + y2 = 0 + 19.81818182

Combine like terms: -19.81818182 + 19.81818182 = 0.00000000
0.00000000 + -7.272727273y + y2 = 0 + 19.81818182
-7.272727273y + y2 = 0 + 19.81818182

Combine like terms: 0 + 19.81818182 = 19.81818182
-7.272727273y + y2 = 19.81818182

The y term is -7.272727273y.  Take half its coefficient (-3.636363637).
Square it (13.22314050) and add it to both sides.

Add '13.22314050' to each side of the equation.
-7.272727273y + 13.22314050 + y2 = 19.81818182 + 13.22314050

Reorder the terms:
13.22314050 + -7.272727273y + y2 = 19.81818182 + 13.22314050

Combine like terms: 19.81818182 + 13.22314050 = 33.04132232
13.22314050 + -7.272727273y + y2 = 33.04132232

Factor a perfect square on the left side:
(y + -3.636363637)(y + -3.636363637) = 33.04132232

Calculate the square root of the right side: 5.748158168

Break this problem into two subproblems by setting 
(y + -3.636363637) equal to 5.748158168 and -5.748158168.

Subproblem 1

y + -3.636363637 = 5.748158168 Simplifying y + -3.636363637 = 5.748158168 Reorder the terms: -3.636363637 + y = 5.748158168 Solving -3.636363637 + y = 5.748158168 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.636363637' to each side of the equation. -3.636363637 + 3.636363637 + y = 5.748158168 + 3.636363637 Combine like terms: -3.636363637 + 3.636363637 = 0.000000000 0.000000000 + y = 5.748158168 + 3.636363637 y = 5.748158168 + 3.636363637 Combine like terms: 5.748158168 + 3.636363637 = 9.384521805 y = 9.384521805 Simplifying y = 9.384521805

Subproblem 2

y + -3.636363637 = -5.748158168 Simplifying y + -3.636363637 = -5.748158168 Reorder the terms: -3.636363637 + y = -5.748158168 Solving -3.636363637 + y = -5.748158168 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.636363637' to each side of the equation. -3.636363637 + 3.636363637 + y = -5.748158168 + 3.636363637 Combine like terms: -3.636363637 + 3.636363637 = 0.000000000 0.000000000 + y = -5.748158168 + 3.636363637 y = -5.748158168 + 3.636363637 Combine like terms: -5.748158168 + 3.636363637 = -2.111794531 y = -2.111794531 Simplifying y = -2.111794531

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.384521805, -2.111794531}

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