7y^2-6y-6=0

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Solution for 7y^2-6y-6=0 equation:


Simplifying
7y2 + -6y + -6 = 0

Reorder the terms:
-6 + -6y + 7y2 = 0

Solving
-6 + -6y + 7y2 = 0

Solving for variable 'y'.

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

Divide each side by '7'.
-0.8571428571 + -0.8571428571y + y2 = 0

Move the constant term to the right:

Add '0.8571428571' to each side of the equation.
-0.8571428571 + -0.8571428571y + 0.8571428571 + y2 = 0 + 0.8571428571

Reorder the terms:
-0.8571428571 + 0.8571428571 + -0.8571428571y + y2 = 0 + 0.8571428571

Combine like terms: -0.8571428571 + 0.8571428571 = 0.0000000000
0.0000000000 + -0.8571428571y + y2 = 0 + 0.8571428571
-0.8571428571y + y2 = 0 + 0.8571428571

Combine like terms: 0 + 0.8571428571 = 0.8571428571
-0.8571428571y + y2 = 0.8571428571

The y term is -0.8571428571y.  Take half its coefficient (-0.4285714286).
Square it (0.1836734694) and add it to both sides.

Add '0.1836734694' to each side of the equation.
-0.8571428571y + 0.1836734694 + y2 = 0.8571428571 + 0.1836734694

Reorder the terms:
0.1836734694 + -0.8571428571y + y2 = 0.8571428571 + 0.1836734694

Combine like terms: 0.8571428571 + 0.1836734694 = 1.0408163265
0.1836734694 + -0.8571428571y + y2 = 1.0408163265

Factor a perfect square on the left side:
(y + -0.4285714286)(y + -0.4285714286) = 1.0408163265

Calculate the square root of the right side: 1.020204061

Break this problem into two subproblems by setting 
(y + -0.4285714286) equal to 1.020204061 and -1.020204061.

Subproblem 1

y + -0.4285714286 = 1.020204061 Simplifying y + -0.4285714286 = 1.020204061 Reorder the terms: -0.4285714286 + y = 1.020204061 Solving -0.4285714286 + y = 1.020204061 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.4285714286' to each side of the equation. -0.4285714286 + 0.4285714286 + y = 1.020204061 + 0.4285714286 Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000 0.0000000000 + y = 1.020204061 + 0.4285714286 y = 1.020204061 + 0.4285714286 Combine like terms: 1.020204061 + 0.4285714286 = 1.4487754896 y = 1.4487754896 Simplifying y = 1.4487754896

Subproblem 2

y + -0.4285714286 = -1.020204061 Simplifying y + -0.4285714286 = -1.020204061 Reorder the terms: -0.4285714286 + y = -1.020204061 Solving -0.4285714286 + y = -1.020204061 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.4285714286' to each side of the equation. -0.4285714286 + 0.4285714286 + y = -1.020204061 + 0.4285714286 Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000 0.0000000000 + y = -1.020204061 + 0.4285714286 y = -1.020204061 + 0.4285714286 Combine like terms: -1.020204061 + 0.4285714286 = -0.5916326324 y = -0.5916326324 Simplifying y = -0.5916326324

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.4487754896, -0.5916326324}

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