9y^2-8y-12=0

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Solution for 9y^2-8y-12=0 equation:


Simplifying
9y2 + -8y + -12 = 0

Reorder the terms:
-12 + -8y + 9y2 = 0

Solving
-12 + -8y + 9y2 = 0

Solving for variable 'y'.

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

Divide each side by '9'.
-1.333333333 + -0.8888888889y + y2 = 0

Move the constant term to the right:

Add '1.333333333' to each side of the equation.
-1.333333333 + -0.8888888889y + 1.333333333 + y2 = 0 + 1.333333333

Reorder the terms:
-1.333333333 + 1.333333333 + -0.8888888889y + y2 = 0 + 1.333333333

Combine like terms: -1.333333333 + 1.333333333 = 0.000000000
0.000000000 + -0.8888888889y + y2 = 0 + 1.333333333
-0.8888888889y + y2 = 0 + 1.333333333

Combine like terms: 0 + 1.333333333 = 1.333333333
-0.8888888889y + y2 = 1.333333333

The y term is -0.8888888889y.  Take half its coefficient (-0.4444444445).
Square it (0.1975308642) and add it to both sides.

Add '0.1975308642' to each side of the equation.
-0.8888888889y + 0.1975308642 + y2 = 1.333333333 + 0.1975308642

Reorder the terms:
0.1975308642 + -0.8888888889y + y2 = 1.333333333 + 0.1975308642

Combine like terms: 1.333333333 + 0.1975308642 = 1.5308641972
0.1975308642 + -0.8888888889y + y2 = 1.5308641972

Factor a perfect square on the left side:
(y + -0.4444444445)(y + -0.4444444445) = 1.5308641972

Calculate the square root of the right side: 1.237280969

Break this problem into two subproblems by setting 
(y + -0.4444444445) equal to 1.237280969 and -1.237280969.

Subproblem 1

y + -0.4444444445 = 1.237280969 Simplifying y + -0.4444444445 = 1.237280969 Reorder the terms: -0.4444444445 + y = 1.237280969 Solving -0.4444444445 + y = 1.237280969 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.4444444445' to each side of the equation. -0.4444444445 + 0.4444444445 + y = 1.237280969 + 0.4444444445 Combine like terms: -0.4444444445 + 0.4444444445 = 0.0000000000 0.0000000000 + y = 1.237280969 + 0.4444444445 y = 1.237280969 + 0.4444444445 Combine like terms: 1.237280969 + 0.4444444445 = 1.6817254135 y = 1.6817254135 Simplifying y = 1.6817254135

Subproblem 2

y + -0.4444444445 = -1.237280969 Simplifying y + -0.4444444445 = -1.237280969 Reorder the terms: -0.4444444445 + y = -1.237280969 Solving -0.4444444445 + y = -1.237280969 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.4444444445' to each side of the equation. -0.4444444445 + 0.4444444445 + y = -1.237280969 + 0.4444444445 Combine like terms: -0.4444444445 + 0.4444444445 = 0.0000000000 0.0000000000 + y = -1.237280969 + 0.4444444445 y = -1.237280969 + 0.4444444445 Combine like terms: -1.237280969 + 0.4444444445 = -0.7928365245 y = -0.7928365245 Simplifying y = -0.7928365245

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.6817254135, -0.7928365245}

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