(7y+6)(5y-4)=94

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Solution for (7y+6)(5y-4)=94 equation:


Simplifying
(7y + 6)(5y + -4) = 94

Reorder the terms:
(6 + 7y)(5y + -4) = 94

Reorder the terms:
(6 + 7y)(-4 + 5y) = 94

Multiply (6 + 7y) * (-4 + 5y)
(6(-4 + 5y) + 7y * (-4 + 5y)) = 94
((-4 * 6 + 5y * 6) + 7y * (-4 + 5y)) = 94
((-24 + 30y) + 7y * (-4 + 5y)) = 94
(-24 + 30y + (-4 * 7y + 5y * 7y)) = 94
(-24 + 30y + (-28y + 35y2)) = 94

Combine like terms: 30y + -28y = 2y
(-24 + 2y + 35y2) = 94

Solving
-24 + 2y + 35y2 = 94

Solving for variable 'y'.

Reorder the terms:
-24 + -94 + 2y + 35y2 = 94 + -94

Combine like terms: -24 + -94 = -118
-118 + 2y + 35y2 = 94 + -94

Combine like terms: 94 + -94 = 0
-118 + 2y + 35y2 = 0

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

Divide each side by '35'.
-3.371428571 + 0.05714285714y + y2 = 0

Move the constant term to the right:

Add '3.371428571' to each side of the equation.
-3.371428571 + 0.05714285714y + 3.371428571 + y2 = 0 + 3.371428571

Reorder the terms:
-3.371428571 + 3.371428571 + 0.05714285714y + y2 = 0 + 3.371428571

Combine like terms: -3.371428571 + 3.371428571 = 0.000000000
0.000000000 + 0.05714285714y + y2 = 0 + 3.371428571
0.05714285714y + y2 = 0 + 3.371428571

Combine like terms: 0 + 3.371428571 = 3.371428571
0.05714285714y + y2 = 3.371428571

The y term is 0.05714285714y.  Take half its coefficient (0.02857142857).
Square it (0.0008163265305) and add it to both sides.

Add '0.0008163265305' to each side of the equation.
0.05714285714y + 0.0008163265305 + y2 = 3.371428571 + 0.0008163265305

Reorder the terms:
0.0008163265305 + 0.05714285714y + y2 = 3.371428571 + 0.0008163265305

Combine like terms: 3.371428571 + 0.0008163265305 = 3.3722448975305
0.0008163265305 + 0.05714285714y + y2 = 3.3722448975305

Factor a perfect square on the left side:
(y + 0.02857142857)(y + 0.02857142857) = 3.3722448975305

Calculate the square root of the right side: 1.83636731

Break this problem into two subproblems by setting 
(y + 0.02857142857) equal to 1.83636731 and -1.83636731.

Subproblem 1

y + 0.02857142857 = 1.83636731 Simplifying y + 0.02857142857 = 1.83636731 Reorder the terms: 0.02857142857 + y = 1.83636731 Solving 0.02857142857 + y = 1.83636731 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.02857142857' to each side of the equation. 0.02857142857 + -0.02857142857 + y = 1.83636731 + -0.02857142857 Combine like terms: 0.02857142857 + -0.02857142857 = 0.00000000000 0.00000000000 + y = 1.83636731 + -0.02857142857 y = 1.83636731 + -0.02857142857 Combine like terms: 1.83636731 + -0.02857142857 = 1.80779588143 y = 1.80779588143 Simplifying y = 1.80779588143

Subproblem 2

y + 0.02857142857 = -1.83636731 Simplifying y + 0.02857142857 = -1.83636731 Reorder the terms: 0.02857142857 + y = -1.83636731 Solving 0.02857142857 + y = -1.83636731 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.02857142857' to each side of the equation. 0.02857142857 + -0.02857142857 + y = -1.83636731 + -0.02857142857 Combine like terms: 0.02857142857 + -0.02857142857 = 0.00000000000 0.00000000000 + y = -1.83636731 + -0.02857142857 y = -1.83636731 + -0.02857142857 Combine like terms: -1.83636731 + -0.02857142857 = -1.86493873857 y = -1.86493873857 Simplifying y = -1.86493873857

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.80779588143, -1.86493873857}

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