x^2+20x-9909=0

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Solution for x^2+20x-9909=0 equation:


Simplifying
x2 + 20x + -9909 = 0

Reorder the terms:
-9909 + 20x + x2 = 0

Solving
-9909 + 20x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '9909' to each side of the equation.
-9909 + 20x + 9909 + x2 = 0 + 9909

Reorder the terms:
-9909 + 9909 + 20x + x2 = 0 + 9909

Combine like terms: -9909 + 9909 = 0
0 + 20x + x2 = 0 + 9909
20x + x2 = 0 + 9909

Combine like terms: 0 + 9909 = 9909
20x + x2 = 9909

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = 9909 + 100

Reorder the terms:
100 + 20x + x2 = 9909 + 100

Combine like terms: 9909 + 100 = 10009
100 + 20x + x2 = 10009

Factor a perfect square on the left side:
(x + 10)(x + 10) = 10009

Calculate the square root of the right side: 100.04498988

Break this problem into two subproblems by setting 
(x + 10) equal to 100.04498988 and -100.04498988.

Subproblem 1

x + 10 = 100.04498988 Simplifying x + 10 = 100.04498988 Reorder the terms: 10 + x = 100.04498988 Solving 10 + x = 100.04498988 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 100.04498988 + -10 Combine like terms: 10 + -10 = 0 0 + x = 100.04498988 + -10 x = 100.04498988 + -10 Combine like terms: 100.04498988 + -10 = 90.04498988 x = 90.04498988 Simplifying x = 90.04498988

Subproblem 2

x + 10 = -100.04498988 Simplifying x + 10 = -100.04498988 Reorder the terms: 10 + x = -100.04498988 Solving 10 + x = -100.04498988 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -100.04498988 + -10 Combine like terms: 10 + -10 = 0 0 + x = -100.04498988 + -10 x = -100.04498988 + -10 Combine like terms: -100.04498988 + -10 = -110.04498988 x = -110.04498988 Simplifying x = -110.04498988

Solution

The solution to the problem is based on the solutions from the subproblems. x = {90.04498988, -110.04498988}

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