(7y+6)(4y-9)=104

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Solution for (7y+6)(4y-9)=104 equation:


Simplifying
(7y + 6)(4y + -9) = 104

Reorder the terms:
(6 + 7y)(4y + -9) = 104

Reorder the terms:
(6 + 7y)(-9 + 4y) = 104

Multiply (6 + 7y) * (-9 + 4y)
(6(-9 + 4y) + 7y * (-9 + 4y)) = 104
((-9 * 6 + 4y * 6) + 7y * (-9 + 4y)) = 104
((-54 + 24y) + 7y * (-9 + 4y)) = 104
(-54 + 24y + (-9 * 7y + 4y * 7y)) = 104
(-54 + 24y + (-63y + 28y2)) = 104

Combine like terms: 24y + -63y = -39y
(-54 + -39y + 28y2) = 104

Solving
-54 + -39y + 28y2 = 104

Solving for variable 'y'.

Reorder the terms:
-54 + -104 + -39y + 28y2 = 104 + -104

Combine like terms: -54 + -104 = -158
-158 + -39y + 28y2 = 104 + -104

Combine like terms: 104 + -104 = 0
-158 + -39y + 28y2 = 0

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

Divide each side by '28'.
-5.642857143 + -1.392857143y + y2 = 0

Move the constant term to the right:

Add '5.642857143' to each side of the equation.
-5.642857143 + -1.392857143y + 5.642857143 + y2 = 0 + 5.642857143

Reorder the terms:
-5.642857143 + 5.642857143 + -1.392857143y + y2 = 0 + 5.642857143

Combine like terms: -5.642857143 + 5.642857143 = 0.000000000
0.000000000 + -1.392857143y + y2 = 0 + 5.642857143
-1.392857143y + y2 = 0 + 5.642857143

Combine like terms: 0 + 5.642857143 = 5.642857143
-1.392857143y + y2 = 5.642857143

The y term is -1.392857143y.  Take half its coefficient (-0.6964285715).
Square it (0.4850127552) and add it to both sides.

Add '0.4850127552' to each side of the equation.
-1.392857143y + 0.4850127552 + y2 = 5.642857143 + 0.4850127552

Reorder the terms:
0.4850127552 + -1.392857143y + y2 = 5.642857143 + 0.4850127552

Combine like terms: 5.642857143 + 0.4850127552 = 6.1278698982
0.4850127552 + -1.392857143y + y2 = 6.1278698982

Factor a perfect square on the left side:
(y + -0.6964285715)(y + -0.6964285715) = 6.1278698982

Calculate the square root of the right side: 2.475453473

Break this problem into two subproblems by setting 
(y + -0.6964285715) equal to 2.475453473 and -2.475453473.

Subproblem 1

y + -0.6964285715 = 2.475453473 Simplifying y + -0.6964285715 = 2.475453473 Reorder the terms: -0.6964285715 + y = 2.475453473 Solving -0.6964285715 + y = 2.475453473 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.6964285715' to each side of the equation. -0.6964285715 + 0.6964285715 + y = 2.475453473 + 0.6964285715 Combine like terms: -0.6964285715 + 0.6964285715 = 0.0000000000 0.0000000000 + y = 2.475453473 + 0.6964285715 y = 2.475453473 + 0.6964285715 Combine like terms: 2.475453473 + 0.6964285715 = 3.1718820445 y = 3.1718820445 Simplifying y = 3.1718820445

Subproblem 2

y + -0.6964285715 = -2.475453473 Simplifying y + -0.6964285715 = -2.475453473 Reorder the terms: -0.6964285715 + y = -2.475453473 Solving -0.6964285715 + y = -2.475453473 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.6964285715' to each side of the equation. -0.6964285715 + 0.6964285715 + y = -2.475453473 + 0.6964285715 Combine like terms: -0.6964285715 + 0.6964285715 = 0.0000000000 0.0000000000 + y = -2.475453473 + 0.6964285715 y = -2.475453473 + 0.6964285715 Combine like terms: -2.475453473 + 0.6964285715 = -1.7790249015 y = -1.7790249015 Simplifying y = -1.7790249015

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.1718820445, -1.7790249015}

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