-8y^2+28y-60=0

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Solution for -8y^2+28y-60=0 equation: 


Simplifying
-8y2 + 28y + -60 = 0

Reorder the terms:
-60 + 28y + -8y2 = 0

Solving
-60 + 28y + -8y2 = 0

Solving for variable 'y'.

Factor out the Greatest Common Factor (GCF), '4'.
4(-15 + 7y + -2y2) = 0

Ignore the factor 4.

Subproblem 1
Set the factor '(-15 + 7y + -2y2)' equal to zero and attempt to solve:

Simplifying
-15 + 7y + -2y2 = 0

Solving
-15 + 7y + -2y2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
7.5 + -3.5y + y2 = 0

Move the constant term to the right:

Add '-7.5' to each side of the equation.
7.5 + -3.5y + -7.5 + y2 = 0 + -7.5

Reorder the terms:
7.5 + -7.5 + -3.5y + y2 = 0 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + -3.5y + y2 = 0 + -7.5
-3.5y + y2 = 0 + -7.5

Combine like terms: 0 + -7.5 = -7.5
-3.5y + y2 = -7.5

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 = -7.5 + 3.0625

Reorder the terms:
3.0625 + -3.5y + y2 = -7.5 + 3.0625

Combine like terms: -7.5 + 3.0625 = -4.4375
3.0625 + -3.5y + y2 = -4.4375

Factor a perfect square on the left side:
(y + -1.75)(y + -1.75) = -4.4375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

This subproblem is being ignored because a solution could not be determined.

The solution to this equation could not be determined.

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