9y^2-3y-8=

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Solution for 9y^2-3y-8= equation:


Simplifying
9y2 + -3y + -8 = 0

Reorder the terms:
-8 + -3y + 9y2 = 0

Solving
-8 + -3y + 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 + -0.3333333333y + y2 = 0

Move the constant term to the right:

Add '0.8888888889' to each side of the equation.
-0.8888888889 + -0.3333333333y + 0.8888888889 + y2 = 0 + 0.8888888889

Reorder the terms:
-0.8888888889 + 0.8888888889 + -0.3333333333y + y2 = 0 + 0.8888888889

Combine like terms: -0.8888888889 + 0.8888888889 = 0.0000000000
0.0000000000 + -0.3333333333y + y2 = 0 + 0.8888888889
-0.3333333333y + y2 = 0 + 0.8888888889

Combine like terms: 0 + 0.8888888889 = 0.8888888889
-0.3333333333y + y2 = 0.8888888889

The y term is -0.3333333333y.  Take half its coefficient (-0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
-0.3333333333y + 0.02777777779 + y2 = 0.8888888889 + 0.02777777779

Reorder the terms:
0.02777777779 + -0.3333333333y + y2 = 0.8888888889 + 0.02777777779

Combine like terms: 0.8888888889 + 0.02777777779 = 0.91666666669
0.02777777779 + -0.3333333333y + y2 = 0.91666666669

Factor a perfect square on the left side:
(y + -0.1666666667)(y + -0.1666666667) = 0.91666666669

Calculate the square root of the right side: 0.957427108

Break this problem into two subproblems by setting 
(y + -0.1666666667) equal to 0.957427108 and -0.957427108.

Subproblem 1

y + -0.1666666667 = 0.957427108 Simplifying y + -0.1666666667 = 0.957427108 Reorder the terms: -0.1666666667 + y = 0.957427108 Solving -0.1666666667 + y = 0.957427108 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1666666667' to each side of the equation. -0.1666666667 + 0.1666666667 + y = 0.957427108 + 0.1666666667 Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000 0.0000000000 + y = 0.957427108 + 0.1666666667 y = 0.957427108 + 0.1666666667 Combine like terms: 0.957427108 + 0.1666666667 = 1.1240937747 y = 1.1240937747 Simplifying y = 1.1240937747

Subproblem 2

y + -0.1666666667 = -0.957427108 Simplifying y + -0.1666666667 = -0.957427108 Reorder the terms: -0.1666666667 + y = -0.957427108 Solving -0.1666666667 + y = -0.957427108 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1666666667' to each side of the equation. -0.1666666667 + 0.1666666667 + y = -0.957427108 + 0.1666666667 Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000 0.0000000000 + y = -0.957427108 + 0.1666666667 y = -0.957427108 + 0.1666666667 Combine like terms: -0.957427108 + 0.1666666667 = -0.7907604413 y = -0.7907604413 Simplifying y = -0.7907604413

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.1240937747, -0.7907604413}

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