72y^2+9y-8=0

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Solution for 72y^2+9y-8=0 equation:


Simplifying
72y2 + 9y + -8 = 0

Reorder the terms:
-8 + 9y + 72y2 = 0

Solving
-8 + 9y + 72y2 = 0

Solving for variable 'y'.

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

Divide each side by '72'.
-0.1111111111 + 0.125y + y2 = 0

Move the constant term to the right:

Add '0.1111111111' to each side of the equation.
-0.1111111111 + 0.125y + 0.1111111111 + y2 = 0 + 0.1111111111

Reorder the terms:
-0.1111111111 + 0.1111111111 + 0.125y + y2 = 0 + 0.1111111111

Combine like terms: -0.1111111111 + 0.1111111111 = 0.0000000000
0.0000000000 + 0.125y + y2 = 0 + 0.1111111111
0.125y + y2 = 0 + 0.1111111111

Combine like terms: 0 + 0.1111111111 = 0.1111111111
0.125y + y2 = 0.1111111111

The y term is 0.125y.  Take half its coefficient (0.0625).
Square it (0.00390625) and add it to both sides.

Add '0.00390625' to each side of the equation.
0.125y + 0.00390625 + y2 = 0.1111111111 + 0.00390625

Reorder the terms:
0.00390625 + 0.125y + y2 = 0.1111111111 + 0.00390625

Combine like terms: 0.1111111111 + 0.00390625 = 0.1150173611
0.00390625 + 0.125y + y2 = 0.1150173611

Factor a perfect square on the left side:
(y + 0.0625)(y + 0.0625) = 0.1150173611

Calculate the square root of the right side: 0.339142096

Break this problem into two subproblems by setting 
(y + 0.0625) equal to 0.339142096 and -0.339142096.

Subproblem 1

y + 0.0625 = 0.339142096 Simplifying y + 0.0625 = 0.339142096 Reorder the terms: 0.0625 + y = 0.339142096 Solving 0.0625 + y = 0.339142096 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.0625' to each side of the equation. 0.0625 + -0.0625 + y = 0.339142096 + -0.0625 Combine like terms: 0.0625 + -0.0625 = 0.0000 0.0000 + y = 0.339142096 + -0.0625 y = 0.339142096 + -0.0625 Combine like terms: 0.339142096 + -0.0625 = 0.276642096 y = 0.276642096 Simplifying y = 0.276642096

Subproblem 2

y + 0.0625 = -0.339142096 Simplifying y + 0.0625 = -0.339142096 Reorder the terms: 0.0625 + y = -0.339142096 Solving 0.0625 + y = -0.339142096 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.0625' to each side of the equation. 0.0625 + -0.0625 + y = -0.339142096 + -0.0625 Combine like terms: 0.0625 + -0.0625 = 0.0000 0.0000 + y = -0.339142096 + -0.0625 y = -0.339142096 + -0.0625 Combine like terms: -0.339142096 + -0.0625 = -0.401642096 y = -0.401642096 Simplifying y = -0.401642096

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.276642096, -0.401642096}

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