2x^2-11x-65=0

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Solution for 2x^2-11x-65=0 equation:


Simplifying
2x2 + -11x + -65 = 0

Reorder the terms:
-65 + -11x + 2x2 = 0

Solving
-65 + -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'.
-32.5 + -5.5x + x2 = 0

Move the constant term to the right:

Add '32.5' to each side of the equation.
-32.5 + -5.5x + 32.5 + x2 = 0 + 32.5

Reorder the terms:
-32.5 + 32.5 + -5.5x + x2 = 0 + 32.5

Combine like terms: -32.5 + 32.5 = 0.0
0.0 + -5.5x + x2 = 0 + 32.5
-5.5x + x2 = 0 + 32.5

Combine like terms: 0 + 32.5 = 32.5
-5.5x + x2 = 32.5

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 = 32.5 + 7.5625

Reorder the terms:
7.5625 + -5.5x + x2 = 32.5 + 7.5625

Combine like terms: 32.5 + 7.5625 = 40.0625
7.5625 + -5.5x + x2 = 40.0625

Factor a perfect square on the left side:
(x + -2.75)(x + -2.75) = 40.0625

Calculate the square root of the right side: 6.329494451

Break this problem into two subproblems by setting 
(x + -2.75) equal to 6.329494451 and -6.329494451.

Subproblem 1

x + -2.75 = 6.329494451 Simplifying x + -2.75 = 6.329494451 Reorder the terms: -2.75 + x = 6.329494451 Solving -2.75 + x = 6.329494451 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 = 6.329494451 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = 6.329494451 + 2.75 x = 6.329494451 + 2.75 Combine like terms: 6.329494451 + 2.75 = 9.079494451 x = 9.079494451 Simplifying x = 9.079494451

Subproblem 2

x + -2.75 = -6.329494451 Simplifying x + -2.75 = -6.329494451 Reorder the terms: -2.75 + x = -6.329494451 Solving -2.75 + x = -6.329494451 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 = -6.329494451 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = -6.329494451 + 2.75 x = -6.329494451 + 2.75 Combine like terms: -6.329494451 + 2.75 = -3.579494451 x = -3.579494451 Simplifying x = -3.579494451

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.079494451, -3.579494451}

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