2x^2-4x-16.31=0

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Solution for 2x^2-4x-16.31=0 equation:


Simplifying
2x2 + -4x + -16.31 = 0

Reorder the terms:
-16.31 + -4x + 2x2 = 0

Solving
-16.31 + -4x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-8.155 + -2x + x2 = 0

Move the constant term to the right:

Add '8.155' to each side of the equation.
-8.155 + -2x + 8.155 + x2 = 0 + 8.155

Reorder the terms:
-8.155 + 8.155 + -2x + x2 = 0 + 8.155

Combine like terms: -8.155 + 8.155 = 0.000
0.000 + -2x + x2 = 0 + 8.155
-2x + x2 = 0 + 8.155

Combine like terms: 0 + 8.155 = 8.155
-2x + x2 = 8.155

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 8.155 + 1

Reorder the terms:
1 + -2x + x2 = 8.155 + 1

Combine like terms: 8.155 + 1 = 9.155
1 + -2x + x2 = 9.155

Factor a perfect square on the left side:
(x + -1)(x + -1) = 9.155

Calculate the square root of the right side: 3.025723054

Break this problem into two subproblems by setting 
(x + -1) equal to 3.025723054 and -3.025723054.

Subproblem 1

x + -1 = 3.025723054 Simplifying x + -1 = 3.025723054 Reorder the terms: -1 + x = 3.025723054 Solving -1 + x = 3.025723054 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 3.025723054 + 1 Combine like terms: -1 + 1 = 0 0 + x = 3.025723054 + 1 x = 3.025723054 + 1 Combine like terms: 3.025723054 + 1 = 4.025723054 x = 4.025723054 Simplifying x = 4.025723054

Subproblem 2

x + -1 = -3.025723054 Simplifying x + -1 = -3.025723054 Reorder the terms: -1 + x = -3.025723054 Solving -1 + x = -3.025723054 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -3.025723054 + 1 Combine like terms: -1 + 1 = 0 0 + x = -3.025723054 + 1 x = -3.025723054 + 1 Combine like terms: -3.025723054 + 1 = -2.025723054 x = -2.025723054 Simplifying x = -2.025723054

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.025723054, -2.025723054}

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