2x^2+22x-39=0

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Solution for 2x^2+22x-39=0 equation:


Simplifying
2x2 + 22x + -39 = 0

Reorder the terms:
-39 + 22x + 2x2 = 0

Solving
-39 + 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'.
-19.5 + 11x + x2 = 0

Move the constant term to the right:

Add '19.5' to each side of the equation.
-19.5 + 11x + 19.5 + x2 = 0 + 19.5

Reorder the terms:
-19.5 + 19.5 + 11x + x2 = 0 + 19.5

Combine like terms: -19.5 + 19.5 = 0.0
0.0 + 11x + x2 = 0 + 19.5
11x + x2 = 0 + 19.5

Combine like terms: 0 + 19.5 = 19.5
11x + x2 = 19.5

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 = 19.5 + 30.25

Reorder the terms:
30.25 + 11x + x2 = 19.5 + 30.25

Combine like terms: 19.5 + 30.25 = 49.75
30.25 + 11x + x2 = 49.75

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 49.75

Calculate the square root of the right side: 7.05336799

Break this problem into two subproblems by setting 
(x + 5.5) equal to 7.05336799 and -7.05336799.

Subproblem 1

x + 5.5 = 7.05336799 Simplifying x + 5.5 = 7.05336799 Reorder the terms: 5.5 + x = 7.05336799 Solving 5.5 + x = 7.05336799 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 = 7.05336799 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 7.05336799 + -5.5 x = 7.05336799 + -5.5 Combine like terms: 7.05336799 + -5.5 = 1.55336799 x = 1.55336799 Simplifying x = 1.55336799

Subproblem 2

x + 5.5 = -7.05336799 Simplifying x + 5.5 = -7.05336799 Reorder the terms: 5.5 + x = -7.05336799 Solving 5.5 + x = -7.05336799 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 = -7.05336799 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -7.05336799 + -5.5 x = -7.05336799 + -5.5 Combine like terms: -7.05336799 + -5.5 = -12.55336799 x = -12.55336799 Simplifying x = -12.55336799

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.55336799, -12.55336799}

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