9y^2-216y+700=0

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Solution for 9y^2-216y+700=0 equation:


Simplifying
9y2 + -216y + 700 = 0

Reorder the terms:
700 + -216y + 9y2 = 0

Solving
700 + -216y + 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'.
77.77777778 + -24y + y2 = 0

Move the constant term to the right:

Add '-77.77777778' to each side of the equation.
77.77777778 + -24y + -77.77777778 + y2 = 0 + -77.77777778

Reorder the terms:
77.77777778 + -77.77777778 + -24y + y2 = 0 + -77.77777778

Combine like terms: 77.77777778 + -77.77777778 = 0.00000000
0.00000000 + -24y + y2 = 0 + -77.77777778
-24y + y2 = 0 + -77.77777778

Combine like terms: 0 + -77.77777778 = -77.77777778
-24y + y2 = -77.77777778

The y term is -24y.  Take half its coefficient (-12).
Square it (144) and add it to both sides.

Add '144' to each side of the equation.
-24y + 144 + y2 = -77.77777778 + 144

Reorder the terms:
144 + -24y + y2 = -77.77777778 + 144

Combine like terms: -77.77777778 + 144 = 66.22222222
144 + -24y + y2 = 66.22222222

Factor a perfect square on the left side:
(y + -12)(y + -12) = 66.22222222

Calculate the square root of the right side: 8.137703744

Break this problem into two subproblems by setting 
(y + -12) equal to 8.137703744 and -8.137703744.

Subproblem 1

y + -12 = 8.137703744 Simplifying y + -12 = 8.137703744 Reorder the terms: -12 + y = 8.137703744 Solving -12 + y = 8.137703744 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + y = 8.137703744 + 12 Combine like terms: -12 + 12 = 0 0 + y = 8.137703744 + 12 y = 8.137703744 + 12 Combine like terms: 8.137703744 + 12 = 20.137703744 y = 20.137703744 Simplifying y = 20.137703744

Subproblem 2

y + -12 = -8.137703744 Simplifying y + -12 = -8.137703744 Reorder the terms: -12 + y = -8.137703744 Solving -12 + y = -8.137703744 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + y = -8.137703744 + 12 Combine like terms: -12 + 12 = 0 0 + y = -8.137703744 + 12 y = -8.137703744 + 12 Combine like terms: -8.137703744 + 12 = 3.862296256 y = 3.862296256 Simplifying y = 3.862296256

Solution

The solution to the problem is based on the solutions from the subproblems. y = {20.137703744, 3.862296256}

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