5y^2-10y-56=0

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Solution for 5y^2-10y-56=0 equation:


Simplifying
5y2 + -10y + -56 = 0

Reorder the terms:
-56 + -10y + 5y2 = 0

Solving
-56 + -10y + 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'.
-11.2 + -2y + y2 = 0

Move the constant term to the right:

Add '11.2' to each side of the equation.
-11.2 + -2y + 11.2 + y2 = 0 + 11.2

Reorder the terms:
-11.2 + 11.2 + -2y + y2 = 0 + 11.2

Combine like terms: -11.2 + 11.2 = 0.0
0.0 + -2y + y2 = 0 + 11.2
-2y + y2 = 0 + 11.2

Combine like terms: 0 + 11.2 = 11.2
-2y + y2 = 11.2

The y term is -2y.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2y + 1 + y2 = 11.2 + 1

Reorder the terms:
1 + -2y + y2 = 11.2 + 1

Combine like terms: 11.2 + 1 = 12.2
1 + -2y + y2 = 12.2

Factor a perfect square on the left side:
(y + -1)(y + -1) = 12.2

Calculate the square root of the right side: 3.492849839

Break this problem into two subproblems by setting 
(y + -1) equal to 3.492849839 and -3.492849839.

Subproblem 1

y + -1 = 3.492849839 Simplifying y + -1 = 3.492849839 Reorder the terms: -1 + y = 3.492849839 Solving -1 + y = 3.492849839 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = 3.492849839 + 1 Combine like terms: -1 + 1 = 0 0 + y = 3.492849839 + 1 y = 3.492849839 + 1 Combine like terms: 3.492849839 + 1 = 4.492849839 y = 4.492849839 Simplifying y = 4.492849839

Subproblem 2

y + -1 = -3.492849839 Simplifying y + -1 = -3.492849839 Reorder the terms: -1 + y = -3.492849839 Solving -1 + y = -3.492849839 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = -3.492849839 + 1 Combine like terms: -1 + 1 = 0 0 + y = -3.492849839 + 1 y = -3.492849839 + 1 Combine like terms: -3.492849839 + 1 = -2.492849839 y = -2.492849839 Simplifying y = -2.492849839

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.492849839, -2.492849839}

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