5y^2-13y-5=-15y

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Solution for 5y^2-13y-5=-15y equation:


Simplifying
5y2 + -13y + -5 = -15y

Reorder the terms:
-5 + -13y + 5y2 = -15y

Solving
-5 + -13y + 5y2 = -15y

Solving for variable 'y'.

Reorder the terms:
-5 + -13y + 15y + 5y2 = -15y + 15y

Combine like terms: -13y + 15y = 2y
-5 + 2y + 5y2 = -15y + 15y

Combine like terms: -15y + 15y = 0
-5 + 2y + 5y2 = 0

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

Divide each side by '5'.
-1 + 0.4y + y2 = 0

Move the constant term to the right:

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

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

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

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

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 = 1 + 0.04

Reorder the terms:
0.04 + 0.4y + y2 = 1 + 0.04

Combine like terms: 1 + 0.04 = 1.04
0.04 + 0.4y + y2 = 1.04

Factor a perfect square on the left side:
(y + 0.2)(y + 0.2) = 1.04

Calculate the square root of the right side: 1.019803903

Break this problem into two subproblems by setting 
(y + 0.2) equal to 1.019803903 and -1.019803903.

Subproblem 1

y + 0.2 = 1.019803903 Simplifying y + 0.2 = 1.019803903 Reorder the terms: 0.2 + y = 1.019803903 Solving 0.2 + y = 1.019803903 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 = 1.019803903 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + y = 1.019803903 + -0.2 y = 1.019803903 + -0.2 Combine like terms: 1.019803903 + -0.2 = 0.819803903 y = 0.819803903 Simplifying y = 0.819803903

Subproblem 2

y + 0.2 = -1.019803903 Simplifying y + 0.2 = -1.019803903 Reorder the terms: 0.2 + y = -1.019803903 Solving 0.2 + y = -1.019803903 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 = -1.019803903 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + y = -1.019803903 + -0.2 y = -1.019803903 + -0.2 Combine like terms: -1.019803903 + -0.2 = -1.219803903 y = -1.219803903 Simplifying y = -1.219803903

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.819803903, -1.219803903}

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