5y^2-26y+31=0

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Solution for 5y^2-26y+31=0 equation:


Simplifying
5y2 + -26y + 31 = 0

Reorder the terms:
31 + -26y + 5y2 = 0

Solving
31 + -26y + 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'.
6.2 + -5.2y + y2 = 0

Move the constant term to the right:

Add '-6.2' to each side of the equation.
6.2 + -5.2y + -6.2 + y2 = 0 + -6.2

Reorder the terms:
6.2 + -6.2 + -5.2y + y2 = 0 + -6.2

Combine like terms: 6.2 + -6.2 = 0.0
0.0 + -5.2y + y2 = 0 + -6.2
-5.2y + y2 = 0 + -6.2

Combine like terms: 0 + -6.2 = -6.2
-5.2y + y2 = -6.2

The y term is -5.2y.  Take half its coefficient (-2.6).
Square it (6.76) and add it to both sides.

Add '6.76' to each side of the equation.
-5.2y + 6.76 + y2 = -6.2 + 6.76

Reorder the terms:
6.76 + -5.2y + y2 = -6.2 + 6.76

Combine like terms: -6.2 + 6.76 = 0.56
6.76 + -5.2y + y2 = 0.56

Factor a perfect square on the left side:
(y + -2.6)(y + -2.6) = 0.56

Calculate the square root of the right side: 0.748331477

Break this problem into two subproblems by setting 
(y + -2.6) equal to 0.748331477 and -0.748331477.

Subproblem 1

y + -2.6 = 0.748331477 Simplifying y + -2.6 = 0.748331477 Reorder the terms: -2.6 + y = 0.748331477 Solving -2.6 + y = 0.748331477 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.6' to each side of the equation. -2.6 + 2.6 + y = 0.748331477 + 2.6 Combine like terms: -2.6 + 2.6 = 0.0 0.0 + y = 0.748331477 + 2.6 y = 0.748331477 + 2.6 Combine like terms: 0.748331477 + 2.6 = 3.348331477 y = 3.348331477 Simplifying y = 3.348331477

Subproblem 2

y + -2.6 = -0.748331477 Simplifying y + -2.6 = -0.748331477 Reorder the terms: -2.6 + y = -0.748331477 Solving -2.6 + y = -0.748331477 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.6' to each side of the equation. -2.6 + 2.6 + y = -0.748331477 + 2.6 Combine like terms: -2.6 + 2.6 = 0.0 0.0 + y = -0.748331477 + 2.6 y = -0.748331477 + 2.6 Combine like terms: -0.748331477 + 2.6 = 1.851668523 y = 1.851668523 Simplifying y = 1.851668523

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.348331477, 1.851668523}

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