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

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


Simplifying
3y(5 + -2y) = y + 5
(5 * 3y + -2y * 3y) = y + 5
(15y + -6y2) = y + 5

Reorder the terms:
15y + -6y2 = 5 + y

Solving
15y + -6y2 = 5 + y

Solving for variable 'y'.

Reorder the terms:
-5 + 15y + -1y + -6y2 = 5 + y + -5 + -1y

Combine like terms: 15y + -1y = 14y
-5 + 14y + -6y2 = 5 + y + -5 + -1y

Reorder the terms:
-5 + 14y + -6y2 = 5 + -5 + y + -1y

Combine like terms: 5 + -5 = 0
-5 + 14y + -6y2 = 0 + y + -1y
-5 + 14y + -6y2 = y + -1y

Combine like terms: y + -1y = 0
-5 + 14y + -6y2 = 0

Begin completing the square.  Divide all terms by
-6 the coefficient of the squared term: 

Divide each side by '-6'.
0.8333333333 + -2.333333333y + y2 = 0

Move the constant term to the right:

Add '-0.8333333333' to each side of the equation.
0.8333333333 + -2.333333333y + -0.8333333333 + y2 = 0 + -0.8333333333

Reorder the terms:
0.8333333333 + -0.8333333333 + -2.333333333y + y2 = 0 + -0.8333333333

Combine like terms: 0.8333333333 + -0.8333333333 = 0.0000000000
0.0000000000 + -2.333333333y + y2 = 0 + -0.8333333333
-2.333333333y + y2 = 0 + -0.8333333333

Combine like terms: 0 + -0.8333333333 = -0.8333333333
-2.333333333y + y2 = -0.8333333333

The y term is -2.333333333y.  Take half its coefficient (-1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
-2.333333333y + 1.361111112 + y2 = -0.8333333333 + 1.361111112

Reorder the terms:
1.361111112 + -2.333333333y + y2 = -0.8333333333 + 1.361111112

Combine like terms: -0.8333333333 + 1.361111112 = 0.5277777787
1.361111112 + -2.333333333y + y2 = 0.5277777787

Factor a perfect square on the left side:
(y + -1.166666667)(y + -1.166666667) = 0.5277777787

Calculate the square root of the right side: 0.726483158

Break this problem into two subproblems by setting 
(y + -1.166666667) equal to 0.726483158 and -0.726483158.

Subproblem 1

y + -1.166666667 = 0.726483158 Simplifying y + -1.166666667 = 0.726483158 Reorder the terms: -1.166666667 + y = 0.726483158 Solving -1.166666667 + y = 0.726483158 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.166666667' to each side of the equation. -1.166666667 + 1.166666667 + y = 0.726483158 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + y = 0.726483158 + 1.166666667 y = 0.726483158 + 1.166666667 Combine like terms: 0.726483158 + 1.166666667 = 1.893149825 y = 1.893149825 Simplifying y = 1.893149825

Subproblem 2

y + -1.166666667 = -0.726483158 Simplifying y + -1.166666667 = -0.726483158 Reorder the terms: -1.166666667 + y = -0.726483158 Solving -1.166666667 + y = -0.726483158 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.166666667' to each side of the equation. -1.166666667 + 1.166666667 + y = -0.726483158 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + y = -0.726483158 + 1.166666667 y = -0.726483158 + 1.166666667 Combine like terms: -0.726483158 + 1.166666667 = 0.440183509 y = 0.440183509 Simplifying y = 0.440183509

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.893149825, 0.440183509}

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