16y^2-56y-49=0

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Solution for 16y^2-56y-49=0 equation:


Simplifying
16y2 + -56y + -49 = 0

Reorder the terms:
-49 + -56y + 16y2 = 0

Solving
-49 + -56y + 16y2 = 0

Solving for variable 'y'.

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

Divide each side by '16'.
-3.0625 + -3.5y + y2 = 0

Move the constant term to the right:

Add '3.0625' to each side of the equation.
-3.0625 + -3.5y + 3.0625 + y2 = 0 + 3.0625

Reorder the terms:
-3.0625 + 3.0625 + -3.5y + y2 = 0 + 3.0625

Combine like terms: -3.0625 + 3.0625 = 0.0000
0.0000 + -3.5y + y2 = 0 + 3.0625
-3.5y + y2 = 0 + 3.0625

Combine like terms: 0 + 3.0625 = 3.0625
-3.5y + y2 = 3.0625

The y term is -3.5y.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5y + 3.0625 + y2 = 3.0625 + 3.0625

Reorder the terms:
3.0625 + -3.5y + y2 = 3.0625 + 3.0625

Combine like terms: 3.0625 + 3.0625 = 6.125
3.0625 + -3.5y + y2 = 6.125

Factor a perfect square on the left side:
(y + -1.75)(y + -1.75) = 6.125

Calculate the square root of the right side: 2.474873734

Break this problem into two subproblems by setting 
(y + -1.75) equal to 2.474873734 and -2.474873734.

Subproblem 1

y + -1.75 = 2.474873734 Simplifying y + -1.75 = 2.474873734 Reorder the terms: -1.75 + y = 2.474873734 Solving -1.75 + y = 2.474873734 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + y = 2.474873734 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + y = 2.474873734 + 1.75 y = 2.474873734 + 1.75 Combine like terms: 2.474873734 + 1.75 = 4.224873734 y = 4.224873734 Simplifying y = 4.224873734

Subproblem 2

y + -1.75 = -2.474873734 Simplifying y + -1.75 = -2.474873734 Reorder the terms: -1.75 + y = -2.474873734 Solving -1.75 + y = -2.474873734 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + y = -2.474873734 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + y = -2.474873734 + 1.75 y = -2.474873734 + 1.75 Combine like terms: -2.474873734 + 1.75 = -0.724873734 y = -0.724873734 Simplifying y = -0.724873734

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.224873734, -0.724873734}

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