-25y^2-128y+112=0

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Solution for -25y^2-128y+112=0 equation:


Simplifying
-25y2 + -128y + 112 = 0

Reorder the terms:
112 + -128y + -25y2 = 0

Solving
112 + -128y + -25y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-25 the coefficient of the squared term: 

Divide each side by '-25'.
-4.48 + 5.12y + y2 = 0

Move the constant term to the right:

Add '4.48' to each side of the equation.
-4.48 + 5.12y + 4.48 + y2 = 0 + 4.48

Reorder the terms:
-4.48 + 4.48 + 5.12y + y2 = 0 + 4.48

Combine like terms: -4.48 + 4.48 = 0.00
0.00 + 5.12y + y2 = 0 + 4.48
5.12y + y2 = 0 + 4.48

Combine like terms: 0 + 4.48 = 4.48
5.12y + y2 = 4.48

The y term is 5.12y.  Take half its coefficient (2.56).
Square it (6.5536) and add it to both sides.

Add '6.5536' to each side of the equation.
5.12y + 6.5536 + y2 = 4.48 + 6.5536

Reorder the terms:
6.5536 + 5.12y + y2 = 4.48 + 6.5536

Combine like terms: 4.48 + 6.5536 = 11.0336
6.5536 + 5.12y + y2 = 11.0336

Factor a perfect square on the left side:
(y + 2.56)(y + 2.56) = 11.0336

Calculate the square root of the right side: 3.321686319

Break this problem into two subproblems by setting 
(y + 2.56) equal to 3.321686319 and -3.321686319.

Subproblem 1

y + 2.56 = 3.321686319 Simplifying y + 2.56 = 3.321686319 Reorder the terms: 2.56 + y = 3.321686319 Solving 2.56 + y = 3.321686319 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.56' to each side of the equation. 2.56 + -2.56 + y = 3.321686319 + -2.56 Combine like terms: 2.56 + -2.56 = 0.00 0.00 + y = 3.321686319 + -2.56 y = 3.321686319 + -2.56 Combine like terms: 3.321686319 + -2.56 = 0.761686319 y = 0.761686319 Simplifying y = 0.761686319

Subproblem 2

y + 2.56 = -3.321686319 Simplifying y + 2.56 = -3.321686319 Reorder the terms: 2.56 + y = -3.321686319 Solving 2.56 + y = -3.321686319 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.56' to each side of the equation. 2.56 + -2.56 + y = -3.321686319 + -2.56 Combine like terms: 2.56 + -2.56 = 0.00 0.00 + y = -3.321686319 + -2.56 y = -3.321686319 + -2.56 Combine like terms: -3.321686319 + -2.56 = -5.881686319 y = -5.881686319 Simplifying y = -5.881686319

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.761686319, -5.881686319}

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