-3(9+8y)2y=-5

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Solution for -3(9+8y)2y=-5 equation:


Simplifying
-3(9 + 8y) * 2y = -5

Reorder the terms for easier multiplication:
-3 * 2y(9 + 8y) = -5

Multiply -3 * 2
-6y(9 + 8y) = -5
(9 * -6y + 8y * -6y) = -5
(-54y + -48y2) = -5

Solving
-54y + -48y2 = -5

Solving for variable 'y'.

Reorder the terms:
5 + -54y + -48y2 = -5 + 5

Combine like terms: -5 + 5 = 0
5 + -54y + -48y2 = 0

Begin completing the square.  Divide all terms by
-48 the coefficient of the squared term: 

Divide each side by '-48'.
-0.1041666667 + 1.125y + y2 = 0

Move the constant term to the right:

Add '0.1041666667' to each side of the equation.
-0.1041666667 + 1.125y + 0.1041666667 + y2 = 0 + 0.1041666667

Reorder the terms:
-0.1041666667 + 0.1041666667 + 1.125y + y2 = 0 + 0.1041666667

Combine like terms: -0.1041666667 + 0.1041666667 = 0.0000000000
0.0000000000 + 1.125y + y2 = 0 + 0.1041666667
1.125y + y2 = 0 + 0.1041666667

Combine like terms: 0 + 0.1041666667 = 0.1041666667
1.125y + y2 = 0.1041666667

The y term is 1.125y.  Take half its coefficient (0.5625).
Square it (0.31640625) and add it to both sides.

Add '0.31640625' to each side of the equation.
1.125y + 0.31640625 + y2 = 0.1041666667 + 0.31640625

Reorder the terms:
0.31640625 + 1.125y + y2 = 0.1041666667 + 0.31640625

Combine like terms: 0.1041666667 + 0.31640625 = 0.4205729167
0.31640625 + 1.125y + y2 = 0.4205729167

Factor a perfect square on the left side:
(y + 0.5625)(y + 0.5625) = 0.4205729167

Calculate the square root of the right side: 0.648515934

Break this problem into two subproblems by setting 
(y + 0.5625) equal to 0.648515934 and -0.648515934.

Subproblem 1

y + 0.5625 = 0.648515934 Simplifying y + 0.5625 = 0.648515934 Reorder the terms: 0.5625 + y = 0.648515934 Solving 0.5625 + y = 0.648515934 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5625' to each side of the equation. 0.5625 + -0.5625 + y = 0.648515934 + -0.5625 Combine like terms: 0.5625 + -0.5625 = 0.0000 0.0000 + y = 0.648515934 + -0.5625 y = 0.648515934 + -0.5625 Combine like terms: 0.648515934 + -0.5625 = 0.086015934 y = 0.086015934 Simplifying y = 0.086015934

Subproblem 2

y + 0.5625 = -0.648515934 Simplifying y + 0.5625 = -0.648515934 Reorder the terms: 0.5625 + y = -0.648515934 Solving 0.5625 + y = -0.648515934 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5625' to each side of the equation. 0.5625 + -0.5625 + y = -0.648515934 + -0.5625 Combine like terms: 0.5625 + -0.5625 = 0.0000 0.0000 + y = -0.648515934 + -0.5625 y = -0.648515934 + -0.5625 Combine like terms: -0.648515934 + -0.5625 = -1.211015934 y = -1.211015934 Simplifying y = -1.211015934

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.086015934, -1.211015934}

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