5y^2-3y-1=0

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Solution for 5y^2-3y-1=0 equation:


Simplifying
5y2 + -3y + -1 = 0

Reorder the terms:
-1 + -3y + 5y2 = 0

Solving
-1 + -3y + 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'.
-0.2 + -0.6y + y2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -0.6y + 0.2 + y2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -0.6y + y2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -0.6y + y2 = 0 + 0.2
-0.6y + y2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-0.6y + y2 = 0.2

The y term is -0.6y.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6y + 0.09 + y2 = 0.2 + 0.09

Reorder the terms:
0.09 + -0.6y + y2 = 0.2 + 0.09

Combine like terms: 0.2 + 0.09 = 0.29
0.09 + -0.6y + y2 = 0.29

Factor a perfect square on the left side:
(y + -0.3)(y + -0.3) = 0.29

Calculate the square root of the right side: 0.538516481

Break this problem into two subproblems by setting 
(y + -0.3) equal to 0.538516481 and -0.538516481.

Subproblem 1

y + -0.3 = 0.538516481 Simplifying y + -0.3 = 0.538516481 Reorder the terms: -0.3 + y = 0.538516481 Solving -0.3 + y = 0.538516481 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + y = 0.538516481 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + y = 0.538516481 + 0.3 y = 0.538516481 + 0.3 Combine like terms: 0.538516481 + 0.3 = 0.838516481 y = 0.838516481 Simplifying y = 0.838516481

Subproblem 2

y + -0.3 = -0.538516481 Simplifying y + -0.3 = -0.538516481 Reorder the terms: -0.3 + y = -0.538516481 Solving -0.3 + y = -0.538516481 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + y = -0.538516481 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + y = -0.538516481 + 0.3 y = -0.538516481 + 0.3 Combine like terms: -0.538516481 + 0.3 = -0.238516481 y = -0.238516481 Simplifying y = -0.238516481

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.838516481, -0.238516481}

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