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

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


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

Reorder the terms:
(-8 + 3y)(5y + 2) = y

Reorder the terms:
(-8 + 3y)(2 + 5y) = y

Multiply (-8 + 3y) * (2 + 5y)
(-8(2 + 5y) + 3y * (2 + 5y)) = y
((2 * -8 + 5y * -8) + 3y * (2 + 5y)) = y
((-16 + -40y) + 3y * (2 + 5y)) = y
(-16 + -40y + (2 * 3y + 5y * 3y)) = y
(-16 + -40y + (6y + 15y2)) = y

Combine like terms: -40y + 6y = -34y
(-16 + -34y + 15y2) = y

Solving
-16 + -34y + 15y2 = y

Solving for variable 'y'.

Reorder the terms:
-16 + -34y + -1y + 15y2 = y + -1y

Combine like terms: -34y + -1y = -35y
-16 + -35y + 15y2 = y + -1y

Combine like terms: y + -1y = 0
-16 + -35y + 15y2 = 0

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

Divide each side by '15'.
-1.066666667 + -2.333333333y + y2 = 0

Move the constant term to the right:

Add '1.066666667' to each side of the equation.
-1.066666667 + -2.333333333y + 1.066666667 + y2 = 0 + 1.066666667

Reorder the terms:
-1.066666667 + 1.066666667 + -2.333333333y + y2 = 0 + 1.066666667

Combine like terms: -1.066666667 + 1.066666667 = 0.000000000
0.000000000 + -2.333333333y + y2 = 0 + 1.066666667
-2.333333333y + y2 = 0 + 1.066666667

Combine like terms: 0 + 1.066666667 = 1.066666667
-2.333333333y + y2 = 1.066666667

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 = 1.066666667 + 1.361111112

Reorder the terms:
1.361111112 + -2.333333333y + y2 = 1.066666667 + 1.361111112

Combine like terms: 1.066666667 + 1.361111112 = 2.427777779
1.361111112 + -2.333333333y + y2 = 2.427777779

Factor a perfect square on the left side:
(y + -1.166666667)(y + -1.166666667) = 2.427777779

Calculate the square root of the right side: 1.558132786

Break this problem into two subproblems by setting 
(y + -1.166666667) equal to 1.558132786 and -1.558132786.

Subproblem 1

y + -1.166666667 = 1.558132786 Simplifying y + -1.166666667 = 1.558132786 Reorder the terms: -1.166666667 + y = 1.558132786 Solving -1.166666667 + y = 1.558132786 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 = 1.558132786 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + y = 1.558132786 + 1.166666667 y = 1.558132786 + 1.166666667 Combine like terms: 1.558132786 + 1.166666667 = 2.724799453 y = 2.724799453 Simplifying y = 2.724799453

Subproblem 2

y + -1.166666667 = -1.558132786 Simplifying y + -1.166666667 = -1.558132786 Reorder the terms: -1.166666667 + y = -1.558132786 Solving -1.166666667 + y = -1.558132786 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 = -1.558132786 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + y = -1.558132786 + 1.166666667 y = -1.558132786 + 1.166666667 Combine like terms: -1.558132786 + 1.166666667 = -0.391466119 y = -0.391466119 Simplifying y = -0.391466119

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.724799453, -0.391466119}

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