5y^2-5y-2=0

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


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

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

Solving
-2 + -5y + 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'.
-0.4 + -1y + y2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -1y + 0.4 + y2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -1y + y2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -1y + y2 = 0 + 0.4
-1y + y2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-1y + y2 = 0.4

The y term is -1y.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1y + 0.25 + y2 = 0.4 + 0.25

Reorder the terms:
0.25 + -1y + y2 = 0.4 + 0.25

Combine like terms: 0.4 + 0.25 = 0.65
0.25 + -1y + y2 = 0.65

Factor a perfect square on the left side:
(y + -0.5)(y + -0.5) = 0.65

Calculate the square root of the right side: 0.806225775

Break this problem into two subproblems by setting 
(y + -0.5) equal to 0.806225775 and -0.806225775.

Subproblem 1

y + -0.5 = 0.806225775 Simplifying y + -0.5 = 0.806225775 Reorder the terms: -0.5 + y = 0.806225775 Solving -0.5 + y = 0.806225775 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = 0.806225775 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = 0.806225775 + 0.5 y = 0.806225775 + 0.5 Combine like terms: 0.806225775 + 0.5 = 1.306225775 y = 1.306225775 Simplifying y = 1.306225775

Subproblem 2

y + -0.5 = -0.806225775 Simplifying y + -0.5 = -0.806225775 Reorder the terms: -0.5 + y = -0.806225775 Solving -0.5 + y = -0.806225775 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = -0.806225775 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = -0.806225775 + 0.5 y = -0.806225775 + 0.5 Combine like terms: -0.806225775 + 0.5 = -0.306225775 y = -0.306225775 Simplifying y = -0.306225775

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.306225775, -0.306225775}

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