(5y^2)-28y-48=0

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Solution for (5y^2)-28y-48=0 equation:


Simplifying
(5y2) + -28y + -48 = 0

Reorder the terms:
-48 + -28y + (5y2) = 0

Solving
-48 + -28y + (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'.
-9.6 + -5.6y + y2 = 0

Move the constant term to the right:

Add '9.6' to each side of the equation.
-9.6 + -5.6y + 9.6 + y2 = 0 + 9.6

Reorder the terms:
-9.6 + 9.6 + -5.6y + y2 = 0 + 9.6

Combine like terms: -9.6 + 9.6 = 0.0
0.0 + -5.6y + y2 = 0 + 9.6
-5.6y + y2 = 0 + 9.6

Combine like terms: 0 + 9.6 = 9.6
-5.6y + y2 = 9.6

The y term is -5.6y.  Take half its coefficient (-2.8).
Square it (7.84) and add it to both sides.

Add '7.84' to each side of the equation.
-5.6y + 7.84 + y2 = 9.6 + 7.84

Reorder the terms:
7.84 + -5.6y + y2 = 9.6 + 7.84

Combine like terms: 9.6 + 7.84 = 17.44
7.84 + -5.6y + y2 = 17.44

Factor a perfect square on the left side:
((y) + -2.8)((y) + -2.8) = 17.44

Calculate the square root of the right side: 4.176122604

Break this problem into two subproblems by setting 
((y) + -2.8) equal to 4.176122604 and -4.176122604.

Subproblem 1

(y) + -2.8 = 4.176122604 Simplifying (y) + -2.8 = 4.176122604 y + -2.8 = 4.176122604 Reorder the terms: -2.8 + y = 4.176122604 Solving -2.8 + y = 4.176122604 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.8' to each side of the equation. -2.8 + 2.8 + y = 4.176122604 + 2.8 Combine like terms: -2.8 + 2.8 = 0.0 0.0 + y = 4.176122604 + 2.8 y = 4.176122604 + 2.8 Combine like terms: 4.176122604 + 2.8 = 6.976122604 y = 6.976122604 Simplifying y = 6.976122604

Subproblem 2

(y) + -2.8 = -4.176122604 Simplifying (y) + -2.8 = -4.176122604 y + -2.8 = -4.176122604 Reorder the terms: -2.8 + y = -4.176122604 Solving -2.8 + y = -4.176122604 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.8' to each side of the equation. -2.8 + 2.8 + y = -4.176122604 + 2.8 Combine like terms: -2.8 + 2.8 = 0.0 0.0 + y = -4.176122604 + 2.8 y = -4.176122604 + 2.8 Combine like terms: -4.176122604 + 2.8 = -1.376122604 y = -1.376122604 Simplifying y = -1.376122604

Solution

The solution to the problem is based on the solutions from the subproblems. y = {6.976122604, -1.376122604}

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