5y^2-6y-4=0

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Solution for 5y^2-6y-4=0 equation:


Simplifying
5y2 + -6y + -4 = 0

Reorder the terms:
-4 + -6y + 5y2 = 0

Solving
-4 + -6y + 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 + -1.2y + y2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + -1.2y + 0.8 + y2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + -1.2y + y2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + -1.2y + y2 = 0 + 0.8
-1.2y + y2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
-1.2y + y2 = 0.8

The y term is -1.2y.  Take half its coefficient (-0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
-1.2y + 0.36 + y2 = 0.8 + 0.36

Reorder the terms:
0.36 + -1.2y + y2 = 0.8 + 0.36

Combine like terms: 0.8 + 0.36 = 1.16
0.36 + -1.2y + y2 = 1.16

Factor a perfect square on the left side:
(y + -0.6)(y + -0.6) = 1.16

Calculate the square root of the right side: 1.077032961

Break this problem into two subproblems by setting 
(y + -0.6) equal to 1.077032961 and -1.077032961.

Subproblem 1

y + -0.6 = 1.077032961 Simplifying y + -0.6 = 1.077032961 Reorder the terms: -0.6 + y = 1.077032961 Solving -0.6 + y = 1.077032961 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + y = 1.077032961 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + y = 1.077032961 + 0.6 y = 1.077032961 + 0.6 Combine like terms: 1.077032961 + 0.6 = 1.677032961 y = 1.677032961 Simplifying y = 1.677032961

Subproblem 2

y + -0.6 = -1.077032961 Simplifying y + -0.6 = -1.077032961 Reorder the terms: -0.6 + y = -1.077032961 Solving -0.6 + y = -1.077032961 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + y = -1.077032961 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + y = -1.077032961 + 0.6 y = -1.077032961 + 0.6 Combine like terms: -1.077032961 + 0.6 = -0.477032961 y = -0.477032961 Simplifying y = -0.477032961

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.677032961, -0.477032961}

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