2x^2-16x-11=0

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Solution for 2x^2-16x-11=0 equation:


Simplifying
2x2 + -16x + -11 = 0

Reorder the terms:
-11 + -16x + 2x2 = 0

Solving
-11 + -16x + 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 + -8x + x2 = 0

Move the constant term to the right:

Add '5.5' to each side of the equation.
-5.5 + -8x + 5.5 + x2 = 0 + 5.5

Reorder the terms:
-5.5 + 5.5 + -8x + x2 = 0 + 5.5

Combine like terms: -5.5 + 5.5 = 0.0
0.0 + -8x + x2 = 0 + 5.5
-8x + x2 = 0 + 5.5

Combine like terms: 0 + 5.5 = 5.5
-8x + x2 = 5.5

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 5.5 + 16

Reorder the terms:
16 + -8x + x2 = 5.5 + 16

Combine like terms: 5.5 + 16 = 21.5
16 + -8x + x2 = 21.5

Factor a perfect square on the left side:
(x + -4)(x + -4) = 21.5

Calculate the square root of the right side: 4.636809248

Break this problem into two subproblems by setting 
(x + -4) equal to 4.636809248 and -4.636809248.

Subproblem 1

x + -4 = 4.636809248 Simplifying x + -4 = 4.636809248 Reorder the terms: -4 + x = 4.636809248 Solving -4 + x = 4.636809248 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 4.636809248 + 4 Combine like terms: -4 + 4 = 0 0 + x = 4.636809248 + 4 x = 4.636809248 + 4 Combine like terms: 4.636809248 + 4 = 8.636809248 x = 8.636809248 Simplifying x = 8.636809248

Subproblem 2

x + -4 = -4.636809248 Simplifying x + -4 = -4.636809248 Reorder the terms: -4 + x = -4.636809248 Solving -4 + x = -4.636809248 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -4.636809248 + 4 Combine like terms: -4 + 4 = 0 0 + x = -4.636809248 + 4 x = -4.636809248 + 4 Combine like terms: -4.636809248 + 4 = -0.636809248 x = -0.636809248 Simplifying x = -0.636809248

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.636809248, -0.636809248}

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