(4y-5)(6-7y)-8*(5y+7)=

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Solution for (4y-5)(6-7y)-8*(5y+7)= equation:


Simplifying
(4y + -5)(6 + -7y) + -8(5y + 7) = 0

Reorder the terms:
(-5 + 4y)(6 + -7y) + -8(5y + 7) = 0

Multiply (-5 + 4y) * (6 + -7y)
(-5(6 + -7y) + 4y * (6 + -7y)) + -8(5y + 7) = 0
((6 * -5 + -7y * -5) + 4y * (6 + -7y)) + -8(5y + 7) = 0
((-30 + 35y) + 4y * (6 + -7y)) + -8(5y + 7) = 0
(-30 + 35y + (6 * 4y + -7y * 4y)) + -8(5y + 7) = 0
(-30 + 35y + (24y + -28y2)) + -8(5y + 7) = 0

Combine like terms: 35y + 24y = 59y
(-30 + 59y + -28y2) + -8(5y + 7) = 0

Reorder the terms:
-30 + 59y + -28y2 + -8(7 + 5y) = 0
-30 + 59y + -28y2 + (7 * -8 + 5y * -8) = 0
-30 + 59y + -28y2 + (-56 + -40y) = 0

Reorder the terms:
-30 + -56 + 59y + -40y + -28y2 = 0

Combine like terms: -30 + -56 = -86
-86 + 59y + -40y + -28y2 = 0

Combine like terms: 59y + -40y = 19y
-86 + 19y + -28y2 = 0

Solving
-86 + 19y + -28y2 = 0

Solving for variable 'y'.

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

Divide each side by '-28'.
3.071428571 + -0.6785714286y + y2 = 0

Move the constant term to the right:

Add '-3.071428571' to each side of the equation.
3.071428571 + -0.6785714286y + -3.071428571 + y2 = 0 + -3.071428571

Reorder the terms:
3.071428571 + -3.071428571 + -0.6785714286y + y2 = 0 + -3.071428571

Combine like terms: 3.071428571 + -3.071428571 = 0.000000000
0.000000000 + -0.6785714286y + y2 = 0 + -3.071428571
-0.6785714286y + y2 = 0 + -3.071428571

Combine like terms: 0 + -3.071428571 = -3.071428571
-0.6785714286y + y2 = -3.071428571

The y term is -0.6785714286y.  Take half its coefficient (-0.3392857143).
Square it (0.1151147959) and add it to both sides.

Add '0.1151147959' to each side of the equation.
-0.6785714286y + 0.1151147959 + y2 = -3.071428571 + 0.1151147959

Reorder the terms:
0.1151147959 + -0.6785714286y + y2 = -3.071428571 + 0.1151147959

Combine like terms: -3.071428571 + 0.1151147959 = -2.9563137751
0.1151147959 + -0.6785714286y + y2 = -2.9563137751

Factor a perfect square on the left side:
(y + -0.3392857143)(y + -0.3392857143) = -2.9563137751

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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