9y^2+9y-8=0

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


Simplifying
9y2 + 9y + -8 = 0

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

Solving
-8 + 9y + 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'.
-0.8888888889 + y + y2 = 0

Move the constant term to the right:

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

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

Combine like terms: -0.8888888889 + 0.8888888889 = 0.0000000000
0.0000000000 + y + y2 = 0 + 0.8888888889
y + y2 = 0 + 0.8888888889

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

The y term is y.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + y2 = 0.8888888889 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + y2 = 0.8888888889 + 0.25

Combine like terms: 0.8888888889 + 0.25 = 1.1388888889
1.25 + y2 = 1.1388888889

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 1.1388888889

Calculate the square root of the right side: 1.067187373

Break this problem into two subproblems by setting 
(y + 0.5) equal to 1.067187373 and -1.067187373.

Subproblem 1

y + 0.5 = 1.067187373 Simplifying y + 0.5 = 1.067187373 Reorder the terms: 0.5 + y = 1.067187373 Solving 0.5 + y = 1.067187373 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = 1.067187373 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 1.067187373 + -0.5 y = 1.067187373 + -0.5 Combine like terms: 1.067187373 + -0.5 = 0.567187373 y = 0.567187373 Simplifying y = 0.567187373

Subproblem 2

y + 0.5 = -1.067187373 Simplifying y + 0.5 = -1.067187373 Reorder the terms: 0.5 + y = -1.067187373 Solving 0.5 + y = -1.067187373 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = -1.067187373 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -1.067187373 + -0.5 y = -1.067187373 + -0.5 Combine like terms: -1.067187373 + -0.5 = -1.567187373 y = -1.567187373 Simplifying y = -1.567187373

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.567187373, -1.567187373}

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