(5+3y)y=11.7

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Solution for (5+3y)y=11.7 equation:


Simplifying
(5 + 3y) * y = 11.7

Reorder the terms for easier multiplication:
y(5 + 3y) = 11.7
(5 * y + 3y * y) = 11.7
(5y + 3y2) = 11.7

Solving
5y + 3y2 = 11.7

Solving for variable 'y'.

Reorder the terms:
-11.7 + 5y + 3y2 = 11.7 + -11.7

Combine like terms: 11.7 + -11.7 = 0.0
-11.7 + 5y + 3y2 = 0.0

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

Divide each side by '3'.
-3.9 + 1.666666667y + y2 = 0.0

Move the constant term to the right:

Add '3.9' to each side of the equation.
-3.9 + 1.666666667y + 3.9 + y2 = 0.0 + 3.9

Reorder the terms:
-3.9 + 3.9 + 1.666666667y + y2 = 0.0 + 3.9

Combine like terms: -3.9 + 3.9 = 0.0
0.0 + 1.666666667y + y2 = 0.0 + 3.9
1.666666667y + y2 = 0.0 + 3.9

Combine like terms: 0.0 + 3.9 = 3.9
1.666666667y + y2 = 3.9

The y term is 1.666666667y.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667y + 0.6944444447 + y2 = 3.9 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667y + y2 = 3.9 + 0.6944444447

Combine like terms: 3.9 + 0.6944444447 = 4.5944444447
0.6944444447 + 1.666666667y + y2 = 4.5944444447

Factor a perfect square on the left side:
(y + 0.8333333335)(y + 0.8333333335) = 4.5944444447

Calculate the square root of the right side: 2.143465522

Break this problem into two subproblems by setting 
(y + 0.8333333335) equal to 2.143465522 and -2.143465522.

Subproblem 1

y + 0.8333333335 = 2.143465522 Simplifying y + 0.8333333335 = 2.143465522 Reorder the terms: 0.8333333335 + y = 2.143465522 Solving 0.8333333335 + y = 2.143465522 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + y = 2.143465522 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + y = 2.143465522 + -0.8333333335 y = 2.143465522 + -0.8333333335 Combine like terms: 2.143465522 + -0.8333333335 = 1.3101321885 y = 1.3101321885 Simplifying y = 1.3101321885

Subproblem 2

y + 0.8333333335 = -2.143465522 Simplifying y + 0.8333333335 = -2.143465522 Reorder the terms: 0.8333333335 + y = -2.143465522 Solving 0.8333333335 + y = -2.143465522 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + y = -2.143465522 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + y = -2.143465522 + -0.8333333335 y = -2.143465522 + -0.8333333335 Combine like terms: -2.143465522 + -0.8333333335 = -2.9767988555 y = -2.9767988555 Simplifying y = -2.9767988555

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.3101321885, -2.9767988555}

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