6y^2-11y-42=0

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Solution for 6y^2-11y-42=0 equation:


Simplifying
6y2 + -11y + -42 = 0

Reorder the terms:
-42 + -11y + 6y2 = 0

Solving
-42 + -11y + 6y2 = 0

Solving for variable 'y'.

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

Divide each side by '6'.
-7 + -1.833333333y + y2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -1.833333333y + 7 + y2 = 0 + 7

Reorder the terms:
-7 + 7 + -1.833333333y + y2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -1.833333333y + y2 = 0 + 7
-1.833333333y + y2 = 0 + 7

Combine like terms: 0 + 7 = 7
-1.833333333y + y2 = 7

The y term is -1.833333333y.  Take half its coefficient (-0.9166666665).
Square it (0.8402777775) and add it to both sides.

Add '0.8402777775' to each side of the equation.
-1.833333333y + 0.8402777775 + y2 = 7 + 0.8402777775

Reorder the terms:
0.8402777775 + -1.833333333y + y2 = 7 + 0.8402777775

Combine like terms: 7 + 0.8402777775 = 7.8402777775
0.8402777775 + -1.833333333y + y2 = 7.8402777775

Factor a perfect square on the left side:
(y + -0.9166666665)(y + -0.9166666665) = 7.8402777775

Calculate the square root of the right side: 2.800049603

Break this problem into two subproblems by setting 
(y + -0.9166666665) equal to 2.800049603 and -2.800049603.

Subproblem 1

y + -0.9166666665 = 2.800049603 Simplifying y + -0.9166666665 = 2.800049603 Reorder the terms: -0.9166666665 + y = 2.800049603 Solving -0.9166666665 + y = 2.800049603 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.9166666665' to each side of the equation. -0.9166666665 + 0.9166666665 + y = 2.800049603 + 0.9166666665 Combine like terms: -0.9166666665 + 0.9166666665 = 0.0000000000 0.0000000000 + y = 2.800049603 + 0.9166666665 y = 2.800049603 + 0.9166666665 Combine like terms: 2.800049603 + 0.9166666665 = 3.7167162695 y = 3.7167162695 Simplifying y = 3.7167162695

Subproblem 2

y + -0.9166666665 = -2.800049603 Simplifying y + -0.9166666665 = -2.800049603 Reorder the terms: -0.9166666665 + y = -2.800049603 Solving -0.9166666665 + y = -2.800049603 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.9166666665' to each side of the equation. -0.9166666665 + 0.9166666665 + y = -2.800049603 + 0.9166666665 Combine like terms: -0.9166666665 + 0.9166666665 = 0.0000000000 0.0000000000 + y = -2.800049603 + 0.9166666665 y = -2.800049603 + 0.9166666665 Combine like terms: -2.800049603 + 0.9166666665 = -1.8833829365 y = -1.8833829365 Simplifying y = -1.8833829365

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.7167162695, -1.8833829365}

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