-(3y+3)(-2y-5)=1

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Solution for -(3y+3)(-2y-5)=1 equation:


Simplifying
-1(3y + 3)(-2y + -5) = 1

Reorder the terms:
-1(3 + 3y)(-2y + -5) = 1

Reorder the terms:
-1(3 + 3y)(-5 + -2y) = 1

Multiply (3 + 3y) * (-5 + -2y)
-1(3(-5 + -2y) + 3y * (-5 + -2y)) = 1
-1((-5 * 3 + -2y * 3) + 3y * (-5 + -2y)) = 1
-1((-15 + -6y) + 3y * (-5 + -2y)) = 1
-1(-15 + -6y + (-5 * 3y + -2y * 3y)) = 1
-1(-15 + -6y + (-15y + -6y2)) = 1

Combine like terms: -6y + -15y = -21y
-1(-15 + -21y + -6y2) = 1
(-15 * -1 + -21y * -1 + -6y2 * -1) = 1
(15 + 21y + 6y2) = 1

Solving
15 + 21y + 6y2 = 1

Solving for variable 'y'.

Reorder the terms:
15 + -1 + 21y + 6y2 = 1 + -1

Combine like terms: 15 + -1 = 14
14 + 21y + 6y2 = 1 + -1

Combine like terms: 1 + -1 = 0
14 + 21y + 6y2 = 0

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

Divide each side by '6'.
2.333333333 + 3.5y + y2 = 0

Move the constant term to the right:

Add '-2.333333333' to each side of the equation.
2.333333333 + 3.5y + -2.333333333 + y2 = 0 + -2.333333333

Reorder the terms:
2.333333333 + -2.333333333 + 3.5y + y2 = 0 + -2.333333333

Combine like terms: 2.333333333 + -2.333333333 = 0.000000000
0.000000000 + 3.5y + y2 = 0 + -2.333333333
3.5y + y2 = 0 + -2.333333333

Combine like terms: 0 + -2.333333333 = -2.333333333
3.5y + y2 = -2.333333333

The y term is 3.5y.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5y + 3.0625 + y2 = -2.333333333 + 3.0625

Reorder the terms:
3.0625 + 3.5y + y2 = -2.333333333 + 3.0625

Combine like terms: -2.333333333 + 3.0625 = 0.729166667
3.0625 + 3.5y + y2 = 0.729166667

Factor a perfect square on the left side:
(y + 1.75)(y + 1.75) = 0.729166667

Calculate the square root of the right side: 0.853912564

Break this problem into two subproblems by setting 
(y + 1.75) equal to 0.853912564 and -0.853912564.

Subproblem 1

y + 1.75 = 0.853912564 Simplifying y + 1.75 = 0.853912564 Reorder the terms: 1.75 + y = 0.853912564 Solving 1.75 + y = 0.853912564 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + y = 0.853912564 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + y = 0.853912564 + -1.75 y = 0.853912564 + -1.75 Combine like terms: 0.853912564 + -1.75 = -0.896087436 y = -0.896087436 Simplifying y = -0.896087436

Subproblem 2

y + 1.75 = -0.853912564 Simplifying y + 1.75 = -0.853912564 Reorder the terms: 1.75 + y = -0.853912564 Solving 1.75 + y = -0.853912564 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + y = -0.853912564 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + y = -0.853912564 + -1.75 y = -0.853912564 + -1.75 Combine like terms: -0.853912564 + -1.75 = -2.603912564 y = -2.603912564 Simplifying y = -2.603912564

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.896087436, -2.603912564}

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