2x^2-9x-99=0

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Solution for 2x^2-9x-99=0 equation:


Simplifying
2x2 + -9x + -99 = 0

Reorder the terms:
-99 + -9x + 2x2 = 0

Solving
-99 + -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'.
-49.5 + -4.5x + x2 = 0

Move the constant term to the right:

Add '49.5' to each side of the equation.
-49.5 + -4.5x + 49.5 + x2 = 0 + 49.5

Reorder the terms:
-49.5 + 49.5 + -4.5x + x2 = 0 + 49.5

Combine like terms: -49.5 + 49.5 = 0.0
0.0 + -4.5x + x2 = 0 + 49.5
-4.5x + x2 = 0 + 49.5

Combine like terms: 0 + 49.5 = 49.5
-4.5x + x2 = 49.5

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 = 49.5 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 49.5 + 5.0625

Combine like terms: 49.5 + 5.0625 = 54.5625
5.0625 + -4.5x + x2 = 54.5625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 54.5625

Calculate the square root of the right side: 7.386643351

Break this problem into two subproblems by setting 
(x + -2.25) equal to 7.386643351 and -7.386643351.

Subproblem 1

x + -2.25 = 7.386643351 Simplifying x + -2.25 = 7.386643351 Reorder the terms: -2.25 + x = 7.386643351 Solving -2.25 + x = 7.386643351 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 = 7.386643351 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 7.386643351 + 2.25 x = 7.386643351 + 2.25 Combine like terms: 7.386643351 + 2.25 = 9.636643351 x = 9.636643351 Simplifying x = 9.636643351

Subproblem 2

x + -2.25 = -7.386643351 Simplifying x + -2.25 = -7.386643351 Reorder the terms: -2.25 + x = -7.386643351 Solving -2.25 + x = -7.386643351 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 = -7.386643351 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -7.386643351 + 2.25 x = -7.386643351 + 2.25 Combine like terms: -7.386643351 + 2.25 = -5.136643351 x = -5.136643351 Simplifying x = -5.136643351

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.636643351, -5.136643351}

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