8y^2+24y+9=0

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Solution for 8y^2+24y+9=0 equation:


Simplifying
8y2 + 24y + 9 = 0

Reorder the terms:
9 + 24y + 8y2 = 0

Solving
9 + 24y + 8y2 = 0

Solving for variable 'y'.

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

Divide each side by '8'.
1.125 + 3y + y2 = 0

Move the constant term to the right:

Add '-1.125' to each side of the equation.
1.125 + 3y + -1.125 + y2 = 0 + -1.125

Reorder the terms:
1.125 + -1.125 + 3y + y2 = 0 + -1.125

Combine like terms: 1.125 + -1.125 = 0.000
0.000 + 3y + y2 = 0 + -1.125
3y + y2 = 0 + -1.125

Combine like terms: 0 + -1.125 = -1.125
3y + y2 = -1.125

The y term is 3y.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3y + 2.25 + y2 = -1.125 + 2.25

Reorder the terms:
2.25 + 3y + y2 = -1.125 + 2.25

Combine like terms: -1.125 + 2.25 = 1.125
2.25 + 3y + y2 = 1.125

Factor a perfect square on the left side:
(y + 1.5)(y + 1.5) = 1.125

Calculate the square root of the right side: 1.060660172

Break this problem into two subproblems by setting 
(y + 1.5) equal to 1.060660172 and -1.060660172.

Subproblem 1

y + 1.5 = 1.060660172 Simplifying y + 1.5 = 1.060660172 Reorder the terms: 1.5 + y = 1.060660172 Solving 1.5 + y = 1.060660172 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + y = 1.060660172 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + y = 1.060660172 + -1.5 y = 1.060660172 + -1.5 Combine like terms: 1.060660172 + -1.5 = -0.439339828 y = -0.439339828 Simplifying y = -0.439339828

Subproblem 2

y + 1.5 = -1.060660172 Simplifying y + 1.5 = -1.060660172 Reorder the terms: 1.5 + y = -1.060660172 Solving 1.5 + y = -1.060660172 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + y = -1.060660172 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + y = -1.060660172 + -1.5 y = -1.060660172 + -1.5 Combine like terms: -1.060660172 + -1.5 = -2.560660172 y = -2.560660172 Simplifying y = -2.560660172

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.439339828, -2.560660172}

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