2x^2-11x=26

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


Simplifying
2x2 + -11x = 26

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

Solving
-11x + 2x2 = 26

Solving for variable 'x'.

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

Combine like terms: 26 + -26 = 0
-26 + -11x + 2x2 = 0

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 = 7.284589287 x = 7.284589287 Simplifying x = 7.284589287

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 = -1.784589287 x = -1.784589287 Simplifying x = -1.784589287

Solution

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

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