3(5+2y)5y=8

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


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

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

Multiply 3 * 5
15y(5 + 2y) = 8
(5 * 15y + 2y * 15y) = 8
(75y + 30y2) = 8

Solving
75y + 30y2 = 8

Solving for variable 'y'.

Reorder the terms:
-8 + 75y + 30y2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + 75y + 30y2 = 0

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

Divide each side by '30'.
-0.2666666667 + 2.5y + y2 = 0.0

Move the constant term to the right:

Add '0.2666666667' to each side of the equation.
-0.2666666667 + 2.5y + 0.2666666667 + y2 = 0.0 + 0.2666666667

Reorder the terms:
-0.2666666667 + 0.2666666667 + 2.5y + y2 = 0.0 + 0.2666666667

Combine like terms: -0.2666666667 + 0.2666666667 = 0.0000000000
0.0000000000 + 2.5y + y2 = 0.0 + 0.2666666667
2.5y + y2 = 0.0 + 0.2666666667

Combine like terms: 0.0 + 0.2666666667 = 0.2666666667
2.5y + y2 = 0.2666666667

The y term is 2.5y.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5y + 1.5625 + y2 = 0.2666666667 + 1.5625

Reorder the terms:
1.5625 + 2.5y + y2 = 0.2666666667 + 1.5625

Combine like terms: 0.2666666667 + 1.5625 = 1.8291666667
1.5625 + 2.5y + y2 = 1.8291666667

Factor a perfect square on the left side:
(y + 1.25)(y + 1.25) = 1.8291666667

Calculate the square root of the right side: 1.352466882

Break this problem into two subproblems by setting 
(y + 1.25) equal to 1.352466882 and -1.352466882.

Subproblem 1

y + 1.25 = 1.352466882 Simplifying y + 1.25 = 1.352466882 Reorder the terms: 1.25 + y = 1.352466882 Solving 1.25 + y = 1.352466882 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + y = 1.352466882 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + y = 1.352466882 + -1.25 y = 1.352466882 + -1.25 Combine like terms: 1.352466882 + -1.25 = 0.102466882 y = 0.102466882 Simplifying y = 0.102466882

Subproblem 2

y + 1.25 = -1.352466882 Simplifying y + 1.25 = -1.352466882 Reorder the terms: 1.25 + y = -1.352466882 Solving 1.25 + y = -1.352466882 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + y = -1.352466882 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + y = -1.352466882 + -1.25 y = -1.352466882 + -1.25 Combine like terms: -1.352466882 + -1.25 = -2.602466882 y = -2.602466882 Simplifying y = -2.602466882

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.102466882, -2.602466882}

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