0=9y^2-66y+97

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Solution for 0=9y^2-66y+97 equation:


Simplifying
0 = 9y2 + -66y + 97

Reorder the terms:
0 = 97 + -66y + 9y2

Solving
0 = 97 + -66y + 9y2

Solving for variable 'y'.

Combine like terms: 0 + -97 = -97
-97 + 66y + -9y2 = 97 + -66y + 9y2 + -97 + 66y + -9y2

Reorder the terms:
-97 + 66y + -9y2 = 97 + -97 + -66y + 66y + 9y2 + -9y2

Combine like terms: 97 + -97 = 0
-97 + 66y + -9y2 = 0 + -66y + 66y + 9y2 + -9y2
-97 + 66y + -9y2 = -66y + 66y + 9y2 + -9y2

Combine like terms: -66y + 66y = 0
-97 + 66y + -9y2 = 0 + 9y2 + -9y2
-97 + 66y + -9y2 = 9y2 + -9y2

Combine like terms: 9y2 + -9y2 = 0
-97 + 66y + -9y2 = 0

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

Divide each side by '-9'.
10.77777778 + -7.333333333y + y2 = 0

Move the constant term to the right:

Add '-10.77777778' to each side of the equation.
10.77777778 + -7.333333333y + -10.77777778 + y2 = 0 + -10.77777778

Reorder the terms:
10.77777778 + -10.77777778 + -7.333333333y + y2 = 0 + -10.77777778

Combine like terms: 10.77777778 + -10.77777778 = 0.00000000
0.00000000 + -7.333333333y + y2 = 0 + -10.77777778
-7.333333333y + y2 = 0 + -10.77777778

Combine like terms: 0 + -10.77777778 = -10.77777778
-7.333333333y + y2 = -10.77777778

The y term is -7.333333333y.  Take half its coefficient (-3.666666667).
Square it (13.44444445) and add it to both sides.

Add '13.44444445' to each side of the equation.
-7.333333333y + 13.44444445 + y2 = -10.77777778 + 13.44444445

Reorder the terms:
13.44444445 + -7.333333333y + y2 = -10.77777778 + 13.44444445

Combine like terms: -10.77777778 + 13.44444445 = 2.66666667
13.44444445 + -7.333333333y + y2 = 2.66666667

Factor a perfect square on the left side:
(y + -3.666666667)(y + -3.666666667) = 2.66666667

Calculate the square root of the right side: 1.632993163

Break this problem into two subproblems by setting 
(y + -3.666666667) equal to 1.632993163 and -1.632993163.

Subproblem 1

y + -3.666666667 = 1.632993163 Simplifying y + -3.666666667 = 1.632993163 Reorder the terms: -3.666666667 + y = 1.632993163 Solving -3.666666667 + y = 1.632993163 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.666666667' to each side of the equation. -3.666666667 + 3.666666667 + y = 1.632993163 + 3.666666667 Combine like terms: -3.666666667 + 3.666666667 = 0.000000000 0.000000000 + y = 1.632993163 + 3.666666667 y = 1.632993163 + 3.666666667 Combine like terms: 1.632993163 + 3.666666667 = 5.29965983 y = 5.29965983 Simplifying y = 5.29965983

Subproblem 2

y + -3.666666667 = -1.632993163 Simplifying y + -3.666666667 = -1.632993163 Reorder the terms: -3.666666667 + y = -1.632993163 Solving -3.666666667 + y = -1.632993163 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.666666667' to each side of the equation. -3.666666667 + 3.666666667 + y = -1.632993163 + 3.666666667 Combine like terms: -3.666666667 + 3.666666667 = 0.000000000 0.000000000 + y = -1.632993163 + 3.666666667 y = -1.632993163 + 3.666666667 Combine like terms: -1.632993163 + 3.666666667 = 2.033673504 y = 2.033673504 Simplifying y = 2.033673504

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.29965983, 2.033673504}

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