x^2+2x-198=0

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Solution for x^2+2x-198=0 equation:


Simplifying
x2 + 2x + -198 = 0

Reorder the terms:
-198 + 2x + x2 = 0

Solving
-198 + 2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '198' to each side of the equation.
-198 + 2x + 198 + x2 = 0 + 198

Reorder the terms:
-198 + 198 + 2x + x2 = 0 + 198

Combine like terms: -198 + 198 = 0
0 + 2x + x2 = 0 + 198
2x + x2 = 0 + 198

Combine like terms: 0 + 198 = 198
2x + x2 = 198

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 198 + 1

Reorder the terms:
1 + 2x + x2 = 198 + 1

Combine like terms: 198 + 1 = 199
1 + 2x + x2 = 199

Factor a perfect square on the left side:
(x + 1)(x + 1) = 199

Calculate the square root of the right side: 14.10673598

Break this problem into two subproblems by setting 
(x + 1) equal to 14.10673598 and -14.10673598.

Subproblem 1

x + 1 = 14.10673598 Simplifying x + 1 = 14.10673598 Reorder the terms: 1 + x = 14.10673598 Solving 1 + x = 14.10673598 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 14.10673598 + -1 Combine like terms: 1 + -1 = 0 0 + x = 14.10673598 + -1 x = 14.10673598 + -1 Combine like terms: 14.10673598 + -1 = 13.10673598 x = 13.10673598 Simplifying x = 13.10673598

Subproblem 2

x + 1 = -14.10673598 Simplifying x + 1 = -14.10673598 Reorder the terms: 1 + x = -14.10673598 Solving 1 + x = -14.10673598 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -14.10673598 + -1 Combine like terms: 1 + -1 = 0 0 + x = -14.10673598 + -1 x = -14.10673598 + -1 Combine like terms: -14.10673598 + -1 = -15.10673598 x = -15.10673598 Simplifying x = -15.10673598

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.10673598, -15.10673598}

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