0=-8x^2-14x+107

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Solution for 0=-8x^2-14x+107 equation:


Simplifying
0 = -8x2 + -14x + 107

Reorder the terms:
0 = 107 + -14x + -8x2

Solving
0 = 107 + -14x + -8x2

Solving for variable 'x'.

Combine like terms: 0 + -107 = -107
-107 + 14x + 8x2 = 107 + -14x + -8x2 + -107 + 14x + 8x2

Reorder the terms:
-107 + 14x + 8x2 = 107 + -107 + -14x + 14x + -8x2 + 8x2

Combine like terms: 107 + -107 = 0
-107 + 14x + 8x2 = 0 + -14x + 14x + -8x2 + 8x2
-107 + 14x + 8x2 = -14x + 14x + -8x2 + 8x2

Combine like terms: -14x + 14x = 0
-107 + 14x + 8x2 = 0 + -8x2 + 8x2
-107 + 14x + 8x2 = -8x2 + 8x2

Combine like terms: -8x2 + 8x2 = 0
-107 + 14x + 8x2 = 0

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

Divide each side by '8'.
-13.375 + 1.75x + x2 = 0

Move the constant term to the right:

Add '13.375' to each side of the equation.
-13.375 + 1.75x + 13.375 + x2 = 0 + 13.375

Reorder the terms:
-13.375 + 13.375 + 1.75x + x2 = 0 + 13.375

Combine like terms: -13.375 + 13.375 = 0.000
0.000 + 1.75x + x2 = 0 + 13.375
1.75x + x2 = 0 + 13.375

Combine like terms: 0 + 13.375 = 13.375
1.75x + x2 = 13.375

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 = 13.375 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = 13.375 + 0.765625

Combine like terms: 13.375 + 0.765625 = 14.140625
0.765625 + 1.75x + x2 = 14.140625

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 14.140625

Calculate the square root of the right side: 3.760402239

Break this problem into two subproblems by setting 
(x + 0.875) equal to 3.760402239 and -3.760402239.

Subproblem 1

x + 0.875 = 3.760402239 Simplifying x + 0.875 = 3.760402239 Reorder the terms: 0.875 + x = 3.760402239 Solving 0.875 + x = 3.760402239 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 = 3.760402239 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 3.760402239 + -0.875 x = 3.760402239 + -0.875 Combine like terms: 3.760402239 + -0.875 = 2.885402239 x = 2.885402239 Simplifying x = 2.885402239

Subproblem 2

x + 0.875 = -3.760402239 Simplifying x + 0.875 = -3.760402239 Reorder the terms: 0.875 + x = -3.760402239 Solving 0.875 + x = -3.760402239 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 = -3.760402239 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -3.760402239 + -0.875 x = -3.760402239 + -0.875 Combine like terms: -3.760402239 + -0.875 = -4.635402239 x = -4.635402239 Simplifying x = -4.635402239

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.885402239, -4.635402239}

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