8x^2+2x=127

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Solution for 8x^2+2x=127 equation:


Simplifying
8x2 + 2x = 127

Reorder the terms:
2x + 8x2 = 127

Solving
2x + 8x2 = 127

Solving for variable 'x'.

Reorder the terms:
-127 + 2x + 8x2 = 127 + -127

Combine like terms: 127 + -127 = 0
-127 + 2x + 8x2 = 0

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

Divide each side by '8'.
-15.875 + 0.25x + x2 = 0

Move the constant term to the right:

Add '15.875' to each side of the equation.
-15.875 + 0.25x + 15.875 + x2 = 0 + 15.875

Reorder the terms:
-15.875 + 15.875 + 0.25x + x2 = 0 + 15.875

Combine like terms: -15.875 + 15.875 = 0.000
0.000 + 0.25x + x2 = 0 + 15.875
0.25x + x2 = 0 + 15.875

Combine like terms: 0 + 15.875 = 15.875
0.25x + x2 = 15.875

The x term is 0.25x.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25x + 0.015625 + x2 = 15.875 + 0.015625

Reorder the terms:
0.015625 + 0.25x + x2 = 15.875 + 0.015625

Combine like terms: 15.875 + 0.015625 = 15.890625
0.015625 + 0.25x + x2 = 15.890625

Factor a perfect square on the left side:
(x + 0.125)(x + 0.125) = 15.890625

Calculate the square root of the right side: 3.98630468

Break this problem into two subproblems by setting 
(x + 0.125) equal to 3.98630468 and -3.98630468.

Subproblem 1

x + 0.125 = 3.98630468 Simplifying x + 0.125 = 3.98630468 Reorder the terms: 0.125 + x = 3.98630468 Solving 0.125 + x = 3.98630468 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = 3.98630468 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = 3.98630468 + -0.125 x = 3.98630468 + -0.125 Combine like terms: 3.98630468 + -0.125 = 3.86130468 x = 3.86130468 Simplifying x = 3.86130468

Subproblem 2

x + 0.125 = -3.98630468 Simplifying x + 0.125 = -3.98630468 Reorder the terms: 0.125 + x = -3.98630468 Solving 0.125 + x = -3.98630468 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = -3.98630468 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = -3.98630468 + -0.125 x = -3.98630468 + -0.125 Combine like terms: -3.98630468 + -0.125 = -4.11130468 x = -4.11130468 Simplifying x = -4.11130468

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.86130468, -4.11130468}

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