2x^2+13x-208=0

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Solution for 2x^2+13x-208=0 equation:


Simplifying
2x2 + 13x + -208 = 0

Reorder the terms:
-208 + 13x + 2x2 = 0

Solving
-208 + 13x + 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'.
-104 + 6.5x + x2 = 0

Move the constant term to the right:

Add '104' to each side of the equation.
-104 + 6.5x + 104 + x2 = 0 + 104

Reorder the terms:
-104 + 104 + 6.5x + x2 = 0 + 104

Combine like terms: -104 + 104 = 0
0 + 6.5x + x2 = 0 + 104
6.5x + x2 = 0 + 104

Combine like terms: 0 + 104 = 104
6.5x + x2 = 104

The x term is 6.5x.  Take half its coefficient (3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
6.5x + 10.5625 + x2 = 104 + 10.5625

Reorder the terms:
10.5625 + 6.5x + x2 = 104 + 10.5625

Combine like terms: 104 + 10.5625 = 114.5625
10.5625 + 6.5x + x2 = 114.5625

Factor a perfect square on the left side:
(x + 3.25)(x + 3.25) = 114.5625

Calculate the square root of the right side: 10.703387314

Break this problem into two subproblems by setting 
(x + 3.25) equal to 10.703387314 and -10.703387314.

Subproblem 1

x + 3.25 = 10.703387314 Simplifying x + 3.25 = 10.703387314 Reorder the terms: 3.25 + x = 10.703387314 Solving 3.25 + x = 10.703387314 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = 10.703387314 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = 10.703387314 + -3.25 x = 10.703387314 + -3.25 Combine like terms: 10.703387314 + -3.25 = 7.453387314 x = 7.453387314 Simplifying x = 7.453387314

Subproblem 2

x + 3.25 = -10.703387314 Simplifying x + 3.25 = -10.703387314 Reorder the terms: 3.25 + x = -10.703387314 Solving 3.25 + x = -10.703387314 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = -10.703387314 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = -10.703387314 + -3.25 x = -10.703387314 + -3.25 Combine like terms: -10.703387314 + -3.25 = -13.953387314 x = -13.953387314 Simplifying x = -13.953387314

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.453387314, -13.953387314}

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