2y^2+5y-1=0

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Solution for 2y^2+5y-1=0 equation:


Simplifying
2y2 + 5y + -1 = 0

Reorder the terms:
-1 + 5y + 2y2 = 0

Solving
-1 + 5y + 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'.
-0.5 + 2.5y + y2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 2.5y + 0.5 + y2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 2.5y + y2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 2.5y + y2 = 0 + 0.5
2.5y + y2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
2.5y + y2 = 0.5

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 = 0.5 + 1.5625

Reorder the terms:
1.5625 + 2.5y + y2 = 0.5 + 1.5625

Combine like terms: 0.5 + 1.5625 = 2.0625
1.5625 + 2.5y + y2 = 2.0625

Factor a perfect square on the left side:
(y + 1.25)(y + 1.25) = 2.0625

Calculate the square root of the right side: 1.436140662

Break this problem into two subproblems by setting 
(y + 1.25) equal to 1.436140662 and -1.436140662.

Subproblem 1

y + 1.25 = 1.436140662 Simplifying y + 1.25 = 1.436140662 Reorder the terms: 1.25 + y = 1.436140662 Solving 1.25 + y = 1.436140662 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + y = 1.436140662 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + y = 1.436140662 + -1.25 y = 1.436140662 + -1.25 Combine like terms: 1.436140662 + -1.25 = 0.186140662 y = 0.186140662 Simplifying y = 0.186140662

Subproblem 2

y + 1.25 = -1.436140662 Simplifying y + 1.25 = -1.436140662 Reorder the terms: 1.25 + y = -1.436140662 Solving 1.25 + y = -1.436140662 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + y = -1.436140662 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + y = -1.436140662 + -1.25 y = -1.436140662 + -1.25 Combine like terms: -1.436140662 + -1.25 = -2.686140662 y = -2.686140662 Simplifying y = -2.686140662

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.186140662, -2.686140662}

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