16x^2-28x-5=0

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Solution for 16x^2-28x-5=0 equation:


Simplifying
16x2 + -28x + -5 = 0

Reorder the terms:
-5 + -28x + 16x2 = 0

Solving
-5 + -28x + 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 + -1.75x + x2 = 0

Move the constant term to the right:

Add '0.3125' to each side of the equation.
-0.3125 + -1.75x + 0.3125 + x2 = 0 + 0.3125

Reorder the terms:
-0.3125 + 0.3125 + -1.75x + x2 = 0 + 0.3125

Combine like terms: -0.3125 + 0.3125 = 0.0000
0.0000 + -1.75x + x2 = 0 + 0.3125
-1.75x + x2 = 0 + 0.3125

Combine like terms: 0 + 0.3125 = 0.3125
-1.75x + x2 = 0.3125

The x term is -1.75x.  Take half its coefficient (-0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
-1.75x + 0.765625 + x2 = 0.3125 + 0.765625

Reorder the terms:
0.765625 + -1.75x + x2 = 0.3125 + 0.765625

Combine like terms: 0.3125 + 0.765625 = 1.078125
0.765625 + -1.75x + x2 = 1.078125

Factor a perfect square on the left side:
(x + -0.875)(x + -0.875) = 1.078125

Calculate the square root of the right side: 1.038327983

Break this problem into two subproblems by setting 
(x + -0.875) equal to 1.038327983 and -1.038327983.

Subproblem 1

x + -0.875 = 1.038327983 Simplifying x + -0.875 = 1.038327983 Reorder the terms: -0.875 + x = 1.038327983 Solving -0.875 + x = 1.038327983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = 1.038327983 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = 1.038327983 + 0.875 x = 1.038327983 + 0.875 Combine like terms: 1.038327983 + 0.875 = 1.913327983 x = 1.913327983 Simplifying x = 1.913327983

Subproblem 2

x + -0.875 = -1.038327983 Simplifying x + -0.875 = -1.038327983 Reorder the terms: -0.875 + x = -1.038327983 Solving -0.875 + x = -1.038327983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = -1.038327983 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = -1.038327983 + 0.875 x = -1.038327983 + 0.875 Combine like terms: -1.038327983 + 0.875 = -0.163327983 x = -0.163327983 Simplifying x = -0.163327983

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.913327983, -0.163327983}

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