2x^2-9x-65=0

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Solution for 2x^2-9x-65=0 equation:


Simplifying
2x2 + -9x + -65 = 0

Reorder the terms:
-65 + -9x + 2x2 = 0

Solving
-65 + -9x + 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 + -4.5x + x2 = 0

Move the constant term to the right:

Add '32.5' to each side of the equation.
-32.5 + -4.5x + 32.5 + x2 = 0 + 32.5

Reorder the terms:
-32.5 + 32.5 + -4.5x + x2 = 0 + 32.5

Combine like terms: -32.5 + 32.5 = 0.0
0.0 + -4.5x + x2 = 0 + 32.5
-4.5x + x2 = 0 + 32.5

Combine like terms: 0 + 32.5 = 32.5
-4.5x + x2 = 32.5

The x term is -4.5x.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x + 5.0625 + x2 = 32.5 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 32.5 + 5.0625

Combine like terms: 32.5 + 5.0625 = 37.5625
5.0625 + -4.5x + x2 = 37.5625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 37.5625

Calculate the square root of the right side: 6.128825336

Break this problem into two subproblems by setting 
(x + -2.25) equal to 6.128825336 and -6.128825336.

Subproblem 1

x + -2.25 = 6.128825336 Simplifying x + -2.25 = 6.128825336 Reorder the terms: -2.25 + x = 6.128825336 Solving -2.25 + x = 6.128825336 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 6.128825336 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 6.128825336 + 2.25 x = 6.128825336 + 2.25 Combine like terms: 6.128825336 + 2.25 = 8.378825336 x = 8.378825336 Simplifying x = 8.378825336

Subproblem 2

x + -2.25 = -6.128825336 Simplifying x + -2.25 = -6.128825336 Reorder the terms: -2.25 + x = -6.128825336 Solving -2.25 + x = -6.128825336 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -6.128825336 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -6.128825336 + 2.25 x = -6.128825336 + 2.25 Combine like terms: -6.128825336 + 2.25 = -3.878825336 x = -3.878825336 Simplifying x = -3.878825336

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.378825336, -3.878825336}

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