11y^2-42y-141=0

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Solution for 11y^2-42y-141=0 equation:


Simplifying
11y2 + -42y + -141 = 0

Reorder the terms:
-141 + -42y + 11y2 = 0

Solving
-141 + -42y + 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'.
-12.81818182 + -3.818181818y + y2 = 0

Move the constant term to the right:

Add '12.81818182' to each side of the equation.
-12.81818182 + -3.818181818y + 12.81818182 + y2 = 0 + 12.81818182

Reorder the terms:
-12.81818182 + 12.81818182 + -3.818181818y + y2 = 0 + 12.81818182

Combine like terms: -12.81818182 + 12.81818182 = 0.00000000
0.00000000 + -3.818181818y + y2 = 0 + 12.81818182
-3.818181818y + y2 = 0 + 12.81818182

Combine like terms: 0 + 12.81818182 = 12.81818182
-3.818181818y + y2 = 12.81818182

The y term is -3.818181818y.  Take half its coefficient (-1.909090909).
Square it (3.644628099) and add it to both sides.

Add '3.644628099' to each side of the equation.
-3.818181818y + 3.644628099 + y2 = 12.81818182 + 3.644628099

Reorder the terms:
3.644628099 + -3.818181818y + y2 = 12.81818182 + 3.644628099

Combine like terms: 12.81818182 + 3.644628099 = 16.462809919
3.644628099 + -3.818181818y + y2 = 16.462809919

Factor a perfect square on the left side:
(y + -1.909090909)(y + -1.909090909) = 16.462809919

Calculate the square root of the right side: 4.057438837

Break this problem into two subproblems by setting 
(y + -1.909090909) equal to 4.057438837 and -4.057438837.

Subproblem 1

y + -1.909090909 = 4.057438837 Simplifying y + -1.909090909 = 4.057438837 Reorder the terms: -1.909090909 + y = 4.057438837 Solving -1.909090909 + y = 4.057438837 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.909090909' to each side of the equation. -1.909090909 + 1.909090909 + y = 4.057438837 + 1.909090909 Combine like terms: -1.909090909 + 1.909090909 = 0.000000000 0.000000000 + y = 4.057438837 + 1.909090909 y = 4.057438837 + 1.909090909 Combine like terms: 4.057438837 + 1.909090909 = 5.966529746 y = 5.966529746 Simplifying y = 5.966529746

Subproblem 2

y + -1.909090909 = -4.057438837 Simplifying y + -1.909090909 = -4.057438837 Reorder the terms: -1.909090909 + y = -4.057438837 Solving -1.909090909 + y = -4.057438837 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.909090909' to each side of the equation. -1.909090909 + 1.909090909 + y = -4.057438837 + 1.909090909 Combine like terms: -1.909090909 + 1.909090909 = 0.000000000 0.000000000 + y = -4.057438837 + 1.909090909 y = -4.057438837 + 1.909090909 Combine like terms: -4.057438837 + 1.909090909 = -2.148347928 y = -2.148347928 Simplifying y = -2.148347928

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.966529746, -2.148347928}

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