2y^2+20y+77=0

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Solution for 2y^2+20y+77=0 equation:


Simplifying
2y2 + 20y + 77 = 0

Reorder the terms:
77 + 20y + 2y2 = 0

Solving
77 + 20y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
38.5 + 10y + y2 = 0

Move the constant term to the right:

Add '-38.5' to each side of the equation.
38.5 + 10y + -38.5 + y2 = 0 + -38.5

Reorder the terms:
38.5 + -38.5 + 10y + y2 = 0 + -38.5

Combine like terms: 38.5 + -38.5 = 0.0
0.0 + 10y + y2 = 0 + -38.5
10y + y2 = 0 + -38.5

Combine like terms: 0 + -38.5 = -38.5
10y + y2 = -38.5

The y term is 10y.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10y + 25 + y2 = -38.5 + 25

Reorder the terms:
25 + 10y + y2 = -38.5 + 25

Combine like terms: -38.5 + 25 = -13.5
25 + 10y + y2 = -13.5

Factor a perfect square on the left side:
(y + 5)(y + 5) = -13.5

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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