2x^2+22x-13=0

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Solution for 2x^2+22x-13=0 equation:


Simplifying
2x2 + 22x + -13 = 0

Reorder the terms:
-13 + 22x + 2x2 = 0

Solving
-13 + 22x + 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'.
-6.5 + 11x + x2 = 0

Move the constant term to the right:

Add '6.5' to each side of the equation.
-6.5 + 11x + 6.5 + x2 = 0 + 6.5

Reorder the terms:
-6.5 + 6.5 + 11x + x2 = 0 + 6.5

Combine like terms: -6.5 + 6.5 = 0.0
0.0 + 11x + x2 = 0 + 6.5
11x + x2 = 0 + 6.5

Combine like terms: 0 + 6.5 = 6.5
11x + x2 = 6.5

The x term is 11x.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11x + 30.25 + x2 = 6.5 + 30.25

Reorder the terms:
30.25 + 11x + x2 = 6.5 + 30.25

Combine like terms: 6.5 + 30.25 = 36.75
30.25 + 11x + x2 = 36.75

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 36.75

Calculate the square root of the right side: 6.062177826

Break this problem into two subproblems by setting 
(x + 5.5) equal to 6.062177826 and -6.062177826.

Subproblem 1

x + 5.5 = 6.062177826 Simplifying x + 5.5 = 6.062177826 Reorder the terms: 5.5 + x = 6.062177826 Solving 5.5 + x = 6.062177826 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = 6.062177826 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 6.062177826 + -5.5 x = 6.062177826 + -5.5 Combine like terms: 6.062177826 + -5.5 = 0.562177826 x = 0.562177826 Simplifying x = 0.562177826

Subproblem 2

x + 5.5 = -6.062177826 Simplifying x + 5.5 = -6.062177826 Reorder the terms: 5.5 + x = -6.062177826 Solving 5.5 + x = -6.062177826 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = -6.062177826 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -6.062177826 + -5.5 x = -6.062177826 + -5.5 Combine like terms: -6.062177826 + -5.5 = -11.562177826 x = -11.562177826 Simplifying x = -11.562177826

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.562177826, -11.562177826}

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