9y^2-80y+92=0

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Solution for 9y^2-80y+92=0 equation:


Simplifying
9y2 + -80y + 92 = 0

Reorder the terms:
92 + -80y + 9y2 = 0

Solving
92 + -80y + 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'.
10.22222222 + -8.888888889y + y2 = 0

Move the constant term to the right:

Add '-10.22222222' to each side of the equation.
10.22222222 + -8.888888889y + -10.22222222 + y2 = 0 + -10.22222222

Reorder the terms:
10.22222222 + -10.22222222 + -8.888888889y + y2 = 0 + -10.22222222

Combine like terms: 10.22222222 + -10.22222222 = 0.00000000
0.00000000 + -8.888888889y + y2 = 0 + -10.22222222
-8.888888889y + y2 = 0 + -10.22222222

Combine like terms: 0 + -10.22222222 = -10.22222222
-8.888888889y + y2 = -10.22222222

The y term is -8.888888889y.  Take half its coefficient (-4.444444445).
Square it (19.75308642) and add it to both sides.

Add '19.75308642' to each side of the equation.
-8.888888889y + 19.75308642 + y2 = -10.22222222 + 19.75308642

Reorder the terms:
19.75308642 + -8.888888889y + y2 = -10.22222222 + 19.75308642

Combine like terms: -10.22222222 + 19.75308642 = 9.5308642
19.75308642 + -8.888888889y + y2 = 9.5308642

Factor a perfect square on the left side:
(y + -4.444444445)(y + -4.444444445) = 9.5308642

Calculate the square root of the right side: 3.087209776

Break this problem into two subproblems by setting 
(y + -4.444444445) equal to 3.087209776 and -3.087209776.

Subproblem 1

y + -4.444444445 = 3.087209776 Simplifying y + -4.444444445 = 3.087209776 Reorder the terms: -4.444444445 + y = 3.087209776 Solving -4.444444445 + y = 3.087209776 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.444444445' to each side of the equation. -4.444444445 + 4.444444445 + y = 3.087209776 + 4.444444445 Combine like terms: -4.444444445 + 4.444444445 = 0.000000000 0.000000000 + y = 3.087209776 + 4.444444445 y = 3.087209776 + 4.444444445 Combine like terms: 3.087209776 + 4.444444445 = 7.531654221 y = 7.531654221 Simplifying y = 7.531654221

Subproblem 2

y + -4.444444445 = -3.087209776 Simplifying y + -4.444444445 = -3.087209776 Reorder the terms: -4.444444445 + y = -3.087209776 Solving -4.444444445 + y = -3.087209776 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.444444445' to each side of the equation. -4.444444445 + 4.444444445 + y = -3.087209776 + 4.444444445 Combine like terms: -4.444444445 + 4.444444445 = 0.000000000 0.000000000 + y = -3.087209776 + 4.444444445 y = -3.087209776 + 4.444444445 Combine like terms: -3.087209776 + 4.444444445 = 1.357234669 y = 1.357234669 Simplifying y = 1.357234669

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.531654221, 1.357234669}

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