2x^2+11x-26=0

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Solution for 2x^2+11x-26=0 equation:


Simplifying
2x2 + 11x + -26 = 0

Reorder the terms:
-26 + 11x + 2x2 = 0

Solving
-26 + 11x + 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'.
-13 + 5.5x + x2 = 0

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + 5.5x + 13 + x2 = 0 + 13

Reorder the terms:
-13 + 13 + 5.5x + x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 5.5x + x2 = 0 + 13
5.5x + x2 = 0 + 13

Combine like terms: 0 + 13 = 13
5.5x + x2 = 13

The x term is 5.5x.  Take half its coefficient (2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
5.5x + 7.5625 + x2 = 13 + 7.5625

Reorder the terms:
7.5625 + 5.5x + x2 = 13 + 7.5625

Combine like terms: 13 + 7.5625 = 20.5625
7.5625 + 5.5x + x2 = 20.5625

Factor a perfect square on the left side:
(x + 2.75)(x + 2.75) = 20.5625

Calculate the square root of the right side: 4.534589287

Break this problem into two subproblems by setting 
(x + 2.75) equal to 4.534589287 and -4.534589287.

Subproblem 1

x + 2.75 = 4.534589287 Simplifying x + 2.75 = 4.534589287 Reorder the terms: 2.75 + x = 4.534589287 Solving 2.75 + x = 4.534589287 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + x = 4.534589287 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + x = 4.534589287 + -2.75 x = 4.534589287 + -2.75 Combine like terms: 4.534589287 + -2.75 = 1.784589287 x = 1.784589287 Simplifying x = 1.784589287

Subproblem 2

x + 2.75 = -4.534589287 Simplifying x + 2.75 = -4.534589287 Reorder the terms: 2.75 + x = -4.534589287 Solving 2.75 + x = -4.534589287 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + x = -4.534589287 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + x = -4.534589287 + -2.75 x = -4.534589287 + -2.75 Combine like terms: -4.534589287 + -2.75 = -7.284589287 x = -7.284589287 Simplifying x = -7.284589287

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.784589287, -7.284589287}

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