128x^2+7x-1=0

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Solution for 128x^2+7x-1=0 equation:


Simplifying
128x2 + 7x + -1 = 0

Reorder the terms:
-1 + 7x + 128x2 = 0

Solving
-1 + 7x + 128x2 = 0

Solving for variable 'x'.

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

Divide each side by '128'.
-0.0078125 + 0.0546875x + x2 = 0

Move the constant term to the right:

Add '0.0078125' to each side of the equation.
-0.0078125 + 0.0546875x + 0.0078125 + x2 = 0 + 0.0078125

Reorder the terms:
-0.0078125 + 0.0078125 + 0.0546875x + x2 = 0 + 0.0078125

Combine like terms: -0.0078125 + 0.0078125 = 0.0000000
0.0000000 + 0.0546875x + x2 = 0 + 0.0078125
0.0546875x + x2 = 0 + 0.0078125

Combine like terms: 0 + 0.0078125 = 0.0078125
0.0546875x + x2 = 0.0078125

The x term is 0.0546875x.  Take half its coefficient (0.02734375).
Square it (0.0007476806641) and add it to both sides.

Add '0.0007476806641' to each side of the equation.
0.0546875x + 0.0007476806641 + x2 = 0.0078125 + 0.0007476806641

Reorder the terms:
0.0007476806641 + 0.0546875x + x2 = 0.0078125 + 0.0007476806641

Combine like terms: 0.0078125 + 0.0007476806641 = 0.0085601806641
0.0007476806641 + 0.0546875x + x2 = 0.0085601806641

Factor a perfect square on the left side:
(x + 0.02734375)(x + 0.02734375) = 0.0085601806641

Calculate the square root of the right side: 0.092521244

Break this problem into two subproblems by setting 
(x + 0.02734375) equal to 0.092521244 and -0.092521244.

Subproblem 1

x + 0.02734375 = 0.092521244 Simplifying x + 0.02734375 = 0.092521244 Reorder the terms: 0.02734375 + x = 0.092521244 Solving 0.02734375 + x = 0.092521244 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.02734375' to each side of the equation. 0.02734375 + -0.02734375 + x = 0.092521244 + -0.02734375 Combine like terms: 0.02734375 + -0.02734375 = 0.00000000 0.00000000 + x = 0.092521244 + -0.02734375 x = 0.092521244 + -0.02734375 Combine like terms: 0.092521244 + -0.02734375 = 0.065177494 x = 0.065177494 Simplifying x = 0.065177494

Subproblem 2

x + 0.02734375 = -0.092521244 Simplifying x + 0.02734375 = -0.092521244 Reorder the terms: 0.02734375 + x = -0.092521244 Solving 0.02734375 + x = -0.092521244 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.02734375' to each side of the equation. 0.02734375 + -0.02734375 + x = -0.092521244 + -0.02734375 Combine like terms: 0.02734375 + -0.02734375 = 0.00000000 0.00000000 + x = -0.092521244 + -0.02734375 x = -0.092521244 + -0.02734375 Combine like terms: -0.092521244 + -0.02734375 = -0.119864994 x = -0.119864994 Simplifying x = -0.119864994

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.065177494, -0.119864994}

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