2x^2-8x-11=0

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Solution for 2x^2-8x-11=0 equation:


Simplifying
2x2 + -8x + -11 = 0

Reorder the terms:
-11 + -8x + 2x2 = 0

Solving
-11 + -8x + 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'.
-5.5 + -4x + x2 = 0

Move the constant term to the right:

Add '5.5' to each side of the equation.
-5.5 + -4x + 5.5 + x2 = 0 + 5.5

Reorder the terms:
-5.5 + 5.5 + -4x + x2 = 0 + 5.5

Combine like terms: -5.5 + 5.5 = 0.0
0.0 + -4x + x2 = 0 + 5.5
-4x + x2 = 0 + 5.5

Combine like terms: 0 + 5.5 = 5.5
-4x + x2 = 5.5

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 5.5 + 4

Reorder the terms:
4 + -4x + x2 = 5.5 + 4

Combine like terms: 5.5 + 4 = 9.5
4 + -4x + x2 = 9.5

Factor a perfect square on the left side:
(x + -2)(x + -2) = 9.5

Calculate the square root of the right side: 3.082207001

Break this problem into two subproblems by setting 
(x + -2) equal to 3.082207001 and -3.082207001.

Subproblem 1

x + -2 = 3.082207001 Simplifying x + -2 = 3.082207001 Reorder the terms: -2 + x = 3.082207001 Solving -2 + x = 3.082207001 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 3.082207001 + 2 Combine like terms: -2 + 2 = 0 0 + x = 3.082207001 + 2 x = 3.082207001 + 2 Combine like terms: 3.082207001 + 2 = 5.082207001 x = 5.082207001 Simplifying x = 5.082207001

Subproblem 2

x + -2 = -3.082207001 Simplifying x + -2 = -3.082207001 Reorder the terms: -2 + x = -3.082207001 Solving -2 + x = -3.082207001 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -3.082207001 + 2 Combine like terms: -2 + 2 = 0 0 + x = -3.082207001 + 2 x = -3.082207001 + 2 Combine like terms: -3.082207001 + 2 = -1.082207001 x = -1.082207001 Simplifying x = -1.082207001

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.082207001, -1.082207001}

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