9x^2-99x-100=0

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Solution for 9x^2-99x-100=0 equation:


Simplifying
9x2 + -99x + -100 = 0

Reorder the terms:
-100 + -99x + 9x2 = 0

Solving
-100 + -99x + 9x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
9 the coefficient of the squared term: 

Divide each side by '9'.
-11.11111111 + -11x + x2 = 0

Move the constant term to the right:

Add '11.11111111' to each side of the equation.
-11.11111111 + -11x + 11.11111111 + x2 = 0 + 11.11111111

Reorder the terms:
-11.11111111 + 11.11111111 + -11x + x2 = 0 + 11.11111111

Combine like terms: -11.11111111 + 11.11111111 = 0.00000000
0.00000000 + -11x + x2 = 0 + 11.11111111
-11x + x2 = 0 + 11.11111111

Combine like terms: 0 + 11.11111111 = 11.11111111
-11x + x2 = 11.11111111

The x term is -11x.  Take half its coefficient (-5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
-11x + 30.25 + x2 = 11.11111111 + 30.25

Reorder the terms:
30.25 + -11x + x2 = 11.11111111 + 30.25

Combine like terms: 11.11111111 + 30.25 = 41.36111111
30.25 + -11x + x2 = 41.36111111

Factor a perfect square on the left side:
(x + -5.5)(x + -5.5) = 41.36111111

Calculate the square root of the right side: 6.43126046

Break this problem into two subproblems by setting 
(x + -5.5) equal to 6.43126046 and -6.43126046.

Subproblem 1

x + -5.5 = 6.43126046 Simplifying x + -5.5 = 6.43126046 Reorder the terms: -5.5 + x = 6.43126046 Solving -5.5 + x = 6.43126046 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + x = 6.43126046 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = 6.43126046 + 5.5 x = 6.43126046 + 5.5 Combine like terms: 6.43126046 + 5.5 = 11.93126046 x = 11.93126046 Simplifying x = 11.93126046

Subproblem 2

x + -5.5 = -6.43126046 Simplifying x + -5.5 = -6.43126046 Reorder the terms: -5.5 + x = -6.43126046 Solving -5.5 + x = -6.43126046 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + x = -6.43126046 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = -6.43126046 + 5.5 x = -6.43126046 + 5.5 Combine like terms: -6.43126046 + 5.5 = -0.93126046 x = -0.93126046 Simplifying x = -0.93126046

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.93126046, -0.93126046}

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