16x^2-56x-5=0

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Solution for 16x^2-56x-5=0 equation:


Simplifying
16x2 + -56x + -5 = 0

Reorder the terms:
-5 + -56x + 16x2 = 0

Solving
-5 + -56x + 16x2 = 0

Solving for variable 'x'.

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

Divide each side by '16'.
-0.3125 + -3.5x + x2 = 0

Move the constant term to the right:

Add '0.3125' to each side of the equation.
-0.3125 + -3.5x + 0.3125 + x2 = 0 + 0.3125

Reorder the terms:
-0.3125 + 0.3125 + -3.5x + x2 = 0 + 0.3125

Combine like terms: -0.3125 + 0.3125 = 0.0000
0.0000 + -3.5x + x2 = 0 + 0.3125
-3.5x + x2 = 0 + 0.3125

Combine like terms: 0 + 0.3125 = 0.3125
-3.5x + x2 = 0.3125

The x term is -3.5x.  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.
-3.5x + 3.0625 + x2 = 0.3125 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 0.3125 + 3.0625

Combine like terms: 0.3125 + 3.0625 = 3.375
3.0625 + -3.5x + x2 = 3.375

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 3.375

Calculate the square root of the right side: 1.837117307

Break this problem into two subproblems by setting 
(x + -1.75) equal to 1.837117307 and -1.837117307.

Subproblem 1

x + -1.75 = 1.837117307 Simplifying x + -1.75 = 1.837117307 Reorder the terms: -1.75 + x = 1.837117307 Solving -1.75 + x = 1.837117307 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 1.837117307 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 1.837117307 + 1.75 x = 1.837117307 + 1.75 Combine like terms: 1.837117307 + 1.75 = 3.587117307 x = 3.587117307 Simplifying x = 3.587117307

Subproblem 2

x + -1.75 = -1.837117307 Simplifying x + -1.75 = -1.837117307 Reorder the terms: -1.75 + x = -1.837117307 Solving -1.75 + x = -1.837117307 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -1.837117307 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -1.837117307 + 1.75 x = -1.837117307 + 1.75 Combine like terms: -1.837117307 + 1.75 = -0.087117307 x = -0.087117307 Simplifying x = -0.087117307

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.587117307, -0.087117307}

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