5y^2-2y-4=0

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Solution for 5y^2-2y-4=0 equation:


Simplifying
5y2 + -2y + -4 = 0

Reorder the terms:
-4 + -2y + 5y2 = 0

Solving
-4 + -2y + 5y2 = 0

Solving for variable 'y'.

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

Divide each side by '5'.
-0.8 + -0.4y + y2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + -0.4y + 0.8 + y2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + -0.4y + y2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + -0.4y + y2 = 0 + 0.8
-0.4y + y2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
-0.4y + y2 = 0.8

The y term is -0.4y.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4y + 0.04 + y2 = 0.8 + 0.04

Reorder the terms:
0.04 + -0.4y + y2 = 0.8 + 0.04

Combine like terms: 0.8 + 0.04 = 0.84
0.04 + -0.4y + y2 = 0.84

Factor a perfect square on the left side:
(y + -0.2)(y + -0.2) = 0.84

Calculate the square root of the right side: 0.916515139

Break this problem into two subproblems by setting 
(y + -0.2) equal to 0.916515139 and -0.916515139.

Subproblem 1

y + -0.2 = 0.916515139 Simplifying y + -0.2 = 0.916515139 Reorder the terms: -0.2 + y = 0.916515139 Solving -0.2 + y = 0.916515139 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + y = 0.916515139 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + y = 0.916515139 + 0.2 y = 0.916515139 + 0.2 Combine like terms: 0.916515139 + 0.2 = 1.116515139 y = 1.116515139 Simplifying y = 1.116515139

Subproblem 2

y + -0.2 = -0.916515139 Simplifying y + -0.2 = -0.916515139 Reorder the terms: -0.2 + y = -0.916515139 Solving -0.2 + y = -0.916515139 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + y = -0.916515139 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + y = -0.916515139 + 0.2 y = -0.916515139 + 0.2 Combine like terms: -0.916515139 + 0.2 = -0.716515139 y = -0.716515139 Simplifying y = -0.716515139

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.116515139, -0.716515139}

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