-2y^2-5y-7=0

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Solution for -2y^2-5y-7=0 equation: 


Simplifying
-2y2 + -5y + -7 = 0

Reorder the terms:
-7 + -5y + -2y2 = 0

Solving
-7 + -5y + -2y2 = 0

Solving for variable 'y'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(7 + 5y + 2y2) = 0

Ignore the factor -1.

Subproblem 1
Set the factor '(7 + 5y + 2y2)' equal to zero and attempt to solve:

Simplifying
7 + 5y + 2y2 = 0

Solving
7 + 5y + 2y2 = 0

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

Divide each side by '2'.
3.5 + 2.5y + y2 = 0

Move the constant term to the right:

Add '-3.5' to each side of the equation.
3.5 + 2.5y + -3.5 + y2 = 0 + -3.5

Reorder the terms:
3.5 + -3.5 + 2.5y + y2 = 0 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + 2.5y + y2 = 0 + -3.5
2.5y + y2 = 0 + -3.5

Combine like terms: 0 + -3.5 = -3.5
2.5y + y2 = -3.5

The y term is 2.5y.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5y + 1.5625 + y2 = -3.5 + 1.5625

Reorder the terms:
1.5625 + 2.5y + y2 = -3.5 + 1.5625

Combine like terms: -3.5 + 1.5625 = -1.9375
1.5625 + 2.5y + y2 = -1.9375

Factor a perfect square on the left side:
(y + 1.25)(y + 1.25) = -1.9375

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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