6-2y-6(3y+7)y=3

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Solution for 6-2y-6(3y+7)y=3 equation:


Simplifying
6 + -2y + -6(3y + 7) * y = 3

Reorder the terms:
6 + -2y + -6(7 + 3y) * y = 3

Reorder the terms for easier multiplication:
6 + -2y + -6y(7 + 3y) = 3
6 + -2y + (7 * -6y + 3y * -6y) = 3
6 + -2y + (-42y + -18y2) = 3

Combine like terms: -2y + -42y = -44y
6 + -44y + -18y2 = 3

Solving
6 + -44y + -18y2 = 3

Solving for variable 'y'.

Reorder the terms:
6 + -3 + -44y + -18y2 = 3 + -3

Combine like terms: 6 + -3 = 3
3 + -44y + -18y2 = 3 + -3

Combine like terms: 3 + -3 = 0
3 + -44y + -18y2 = 0

Begin completing the square.  Divide all terms by
-18 the coefficient of the squared term: 

Divide each side by '-18'.
-0.1666666667 + 2.444444444y + y2 = 0

Move the constant term to the right:

Add '0.1666666667' to each side of the equation.
-0.1666666667 + 2.444444444y + 0.1666666667 + y2 = 0 + 0.1666666667

Reorder the terms:
-0.1666666667 + 0.1666666667 + 2.444444444y + y2 = 0 + 0.1666666667

Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000
0.0000000000 + 2.444444444y + y2 = 0 + 0.1666666667
2.444444444y + y2 = 0 + 0.1666666667

Combine like terms: 0 + 0.1666666667 = 0.1666666667
2.444444444y + y2 = 0.1666666667

The y term is 2.444444444y.  Take half its coefficient (1.222222222).
Square it (1.493827160) and add it to both sides.

Add '1.493827160' to each side of the equation.
2.444444444y + 1.493827160 + y2 = 0.1666666667 + 1.493827160

Reorder the terms:
1.493827160 + 2.444444444y + y2 = 0.1666666667 + 1.493827160

Combine like terms: 0.1666666667 + 1.493827160 = 1.6604938267
1.493827160 + 2.444444444y + y2 = 1.6604938267

Factor a perfect square on the left side:
(y + 1.222222222)(y + 1.222222222) = 1.6604938267

Calculate the square root of the right side: 1.2886015

Break this problem into two subproblems by setting 
(y + 1.222222222) equal to 1.2886015 and -1.2886015.

Subproblem 1

y + 1.222222222 = 1.2886015 Simplifying y + 1.222222222 = 1.2886015 Reorder the terms: 1.222222222 + y = 1.2886015 Solving 1.222222222 + y = 1.2886015 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.222222222' to each side of the equation. 1.222222222 + -1.222222222 + y = 1.2886015 + -1.222222222 Combine like terms: 1.222222222 + -1.222222222 = 0.000000000 0.000000000 + y = 1.2886015 + -1.222222222 y = 1.2886015 + -1.222222222 Combine like terms: 1.2886015 + -1.222222222 = 0.066379278 y = 0.066379278 Simplifying y = 0.066379278

Subproblem 2

y + 1.222222222 = -1.2886015 Simplifying y + 1.222222222 = -1.2886015 Reorder the terms: 1.222222222 + y = -1.2886015 Solving 1.222222222 + y = -1.2886015 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.222222222' to each side of the equation. 1.222222222 + -1.222222222 + y = -1.2886015 + -1.222222222 Combine like terms: 1.222222222 + -1.222222222 = 0.000000000 0.000000000 + y = -1.2886015 + -1.222222222 y = -1.2886015 + -1.222222222 Combine like terms: -1.2886015 + -1.222222222 = -2.510823722 y = -2.510823722 Simplifying y = -2.510823722

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.066379278, -2.510823722}

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