16x^2-8x-57=0

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Solution for 16x^2-8x-57=0 equation:


Simplifying
16x2 + -8x + -57 = 0

Reorder the terms:
-57 + -8x + 16x2 = 0

Solving
-57 + -8x + 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'.
-3.5625 + -0.5x + x2 = 0

Move the constant term to the right:

Add '3.5625' to each side of the equation.
-3.5625 + -0.5x + 3.5625 + x2 = 0 + 3.5625

Reorder the terms:
-3.5625 + 3.5625 + -0.5x + x2 = 0 + 3.5625

Combine like terms: -3.5625 + 3.5625 = 0.0000
0.0000 + -0.5x + x2 = 0 + 3.5625
-0.5x + x2 = 0 + 3.5625

Combine like terms: 0 + 3.5625 = 3.5625
-0.5x + x2 = 3.5625

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 3.5625 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 3.5625 + 0.0625

Combine like terms: 3.5625 + 0.0625 = 3.625
0.0625 + -0.5x + x2 = 3.625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 3.625

Calculate the square root of the right side: 1.903943276

Break this problem into two subproblems by setting 
(x + -0.25) equal to 1.903943276 and -1.903943276.

Subproblem 1

x + -0.25 = 1.903943276 Simplifying x + -0.25 = 1.903943276 Reorder the terms: -0.25 + x = 1.903943276 Solving -0.25 + x = 1.903943276 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 1.903943276 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 1.903943276 + 0.25 x = 1.903943276 + 0.25 Combine like terms: 1.903943276 + 0.25 = 2.153943276 x = 2.153943276 Simplifying x = 2.153943276

Subproblem 2

x + -0.25 = -1.903943276 Simplifying x + -0.25 = -1.903943276 Reorder the terms: -0.25 + x = -1.903943276 Solving -0.25 + x = -1.903943276 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -1.903943276 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -1.903943276 + 0.25 x = -1.903943276 + 0.25 Combine like terms: -1.903943276 + 0.25 = -1.653943276 x = -1.653943276 Simplifying x = -1.653943276

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.153943276, -1.653943276}

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