(3y+11)(6y-1)=180

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Solution for (3y+11)(6y-1)=180 equation:


Simplifying
(3y + 11)(6y + -1) = 180

Reorder the terms:
(11 + 3y)(6y + -1) = 180

Reorder the terms:
(11 + 3y)(-1 + 6y) = 180

Multiply (11 + 3y) * (-1 + 6y)
(11(-1 + 6y) + 3y * (-1 + 6y)) = 180
((-1 * 11 + 6y * 11) + 3y * (-1 + 6y)) = 180
((-11 + 66y) + 3y * (-1 + 6y)) = 180
(-11 + 66y + (-1 * 3y + 6y * 3y)) = 180
(-11 + 66y + (-3y + 18y2)) = 180

Combine like terms: 66y + -3y = 63y
(-11 + 63y + 18y2) = 180

Solving
-11 + 63y + 18y2 = 180

Solving for variable 'y'.

Reorder the terms:
-11 + -180 + 63y + 18y2 = 180 + -180

Combine like terms: -11 + -180 = -191
-191 + 63y + 18y2 = 180 + -180

Combine like terms: 180 + -180 = 0
-191 + 63y + 18y2 = 0

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

Divide each side by '18'.
-10.61111111 + 3.5y + y2 = 0

Move the constant term to the right:

Add '10.61111111' to each side of the equation.
-10.61111111 + 3.5y + 10.61111111 + y2 = 0 + 10.61111111

Reorder the terms:
-10.61111111 + 10.61111111 + 3.5y + y2 = 0 + 10.61111111

Combine like terms: -10.61111111 + 10.61111111 = 0.00000000
0.00000000 + 3.5y + y2 = 0 + 10.61111111
3.5y + y2 = 0 + 10.61111111

Combine like terms: 0 + 10.61111111 = 10.61111111
3.5y + y2 = 10.61111111

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 = 10.61111111 + 3.0625

Reorder the terms:
3.0625 + 3.5y + y2 = 10.61111111 + 3.0625

Combine like terms: 10.61111111 + 3.0625 = 13.67361111
3.0625 + 3.5y + y2 = 13.67361111

Factor a perfect square on the left side:
(y + 1.75)(y + 1.75) = 13.67361111

Calculate the square root of the right side: 3.697784622

Break this problem into two subproblems by setting 
(y + 1.75) equal to 3.697784622 and -3.697784622.

Subproblem 1

y + 1.75 = 3.697784622 Simplifying y + 1.75 = 3.697784622 Reorder the terms: 1.75 + y = 3.697784622 Solving 1.75 + y = 3.697784622 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 = 3.697784622 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + y = 3.697784622 + -1.75 y = 3.697784622 + -1.75 Combine like terms: 3.697784622 + -1.75 = 1.947784622 y = 1.947784622 Simplifying y = 1.947784622

Subproblem 2

y + 1.75 = -3.697784622 Simplifying y + 1.75 = -3.697784622 Reorder the terms: 1.75 + y = -3.697784622 Solving 1.75 + y = -3.697784622 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 = -3.697784622 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + y = -3.697784622 + -1.75 y = -3.697784622 + -1.75 Combine like terms: -3.697784622 + -1.75 = -5.447784622 y = -5.447784622 Simplifying y = -5.447784622

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.947784622, -5.447784622}

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