(x^2)+x-99=0

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Solution for (x^2)+x-99=0 equation:


Simplifying
(x2) + x + -99 = 0
x2 + x + -99 = 0

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

Solving
-99 + x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '99' to each side of the equation.
-99 + x + 99 + x2 = 0 + 99

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

Combine like terms: -99 + 99 = 0
0 + x + x2 = 0 + 99
x + x2 = 0 + 99

Combine like terms: 0 + 99 = 99
x + x2 = 99

The x term is x.  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.
x + 0.25 + x2 = 99 + 0.25

Reorder the terms:
0.25 + x + x2 = 99 + 0.25

Combine like terms: 99 + 0.25 = 99.25
0.25 + x + x2 = 99.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 99.25

Calculate the square root of the right side: 9.962429423

Break this problem into two subproblems by setting 
(x + 0.5) equal to 9.962429423 and -9.962429423.

Subproblem 1

x + 0.5 = 9.962429423 Simplifying x + 0.5 = 9.962429423 Reorder the terms: 0.5 + x = 9.962429423 Solving 0.5 + x = 9.962429423 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 = 9.962429423 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 9.962429423 + -0.5 x = 9.962429423 + -0.5 Combine like terms: 9.962429423 + -0.5 = 9.462429423 x = 9.462429423 Simplifying x = 9.462429423

Subproblem 2

x + 0.5 = -9.962429423 Simplifying x + 0.5 = -9.962429423 Reorder the terms: 0.5 + x = -9.962429423 Solving 0.5 + x = -9.962429423 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 = -9.962429423 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -9.962429423 + -0.5 x = -9.962429423 + -0.5 Combine like terms: -9.962429423 + -0.5 = -10.462429423 x = -10.462429423 Simplifying x = -10.462429423

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.462429423, -10.462429423}

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