2x^2-2x-99=0

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


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

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

Solving
-99 + -2x + 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 + -1x + x2 = 0

Move the constant term to the right:

Add '49.5' to each side of the equation.
-49.5 + -1x + 49.5 + x2 = 0 + 49.5

Reorder the terms:
-49.5 + 49.5 + -1x + x2 = 0 + 49.5

Combine like terms: -49.5 + 49.5 = 0.0
0.0 + -1x + x2 = 0 + 49.5
-1x + x2 = 0 + 49.5

Combine like terms: 0 + 49.5 = 49.5
-1x + x2 = 49.5

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 49.5 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 49.5 + 0.25

Combine like terms: 49.5 + 0.25 = 49.75
0.25 + -1x + x2 = 49.75

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 49.75

Calculate the square root of the right side: 7.05336799

Break this problem into two subproblems by setting 
(x + -0.5) equal to 7.05336799 and -7.05336799.

Subproblem 1

x + -0.5 = 7.05336799 Simplifying x + -0.5 = 7.05336799 Reorder the terms: -0.5 + x = 7.05336799 Solving -0.5 + x = 7.05336799 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 7.05336799 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 7.05336799 + 0.5 x = 7.05336799 + 0.5 Combine like terms: 7.05336799 + 0.5 = 7.55336799 x = 7.55336799 Simplifying x = 7.55336799

Subproblem 2

x + -0.5 = -7.05336799 Simplifying x + -0.5 = -7.05336799 Reorder the terms: -0.5 + x = -7.05336799 Solving -0.5 + x = -7.05336799 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -7.05336799 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -7.05336799 + 0.5 x = -7.05336799 + 0.5 Combine like terms: -7.05336799 + 0.5 = -6.55336799 x = -6.55336799 Simplifying x = -6.55336799

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.55336799, -6.55336799}

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