x^2+2x-205=0

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Solution for x^2+2x-205=0 equation:


Simplifying
x2 + 2x + -205 = 0

Reorder the terms:
-205 + 2x + x2 = 0

Solving
-205 + 2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '205' to each side of the equation.
-205 + 2x + 205 + x2 = 0 + 205

Reorder the terms:
-205 + 205 + 2x + x2 = 0 + 205

Combine like terms: -205 + 205 = 0
0 + 2x + x2 = 0 + 205
2x + x2 = 0 + 205

Combine like terms: 0 + 205 = 205
2x + x2 = 205

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 = 205 + 1

Reorder the terms:
1 + 2x + x2 = 205 + 1

Combine like terms: 205 + 1 = 206
1 + 2x + x2 = 206

Factor a perfect square on the left side:
(x + 1)(x + 1) = 206

Calculate the square root of the right side: 14.352700094

Break this problem into two subproblems by setting 
(x + 1) equal to 14.352700094 and -14.352700094.

Subproblem 1

x + 1 = 14.352700094 Simplifying x + 1 = 14.352700094 Reorder the terms: 1 + x = 14.352700094 Solving 1 + x = 14.352700094 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 = 14.352700094 + -1 Combine like terms: 1 + -1 = 0 0 + x = 14.352700094 + -1 x = 14.352700094 + -1 Combine like terms: 14.352700094 + -1 = 13.352700094 x = 13.352700094 Simplifying x = 13.352700094

Subproblem 2

x + 1 = -14.352700094 Simplifying x + 1 = -14.352700094 Reorder the terms: 1 + x = -14.352700094 Solving 1 + x = -14.352700094 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 = -14.352700094 + -1 Combine like terms: 1 + -1 = 0 0 + x = -14.352700094 + -1 x = -14.352700094 + -1 Combine like terms: -14.352700094 + -1 = -15.352700094 x = -15.352700094 Simplifying x = -15.352700094

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.352700094, -15.352700094}

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