x^2+2x=329

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Solution for x^2+2x=329 equation:


Simplifying
x2 + 2x = 329

Reorder the terms:
2x + x2 = 329

Solving
2x + x2 = 329

Solving for variable 'x'.

Reorder the terms:
-329 + 2x + x2 = 329 + -329

Combine like terms: 329 + -329 = 0
-329 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '329' to each side of the equation.
-329 + 2x + 329 + x2 = 0 + 329

Reorder the terms:
-329 + 329 + 2x + x2 = 0 + 329

Combine like terms: -329 + 329 = 0
0 + 2x + x2 = 0 + 329
2x + x2 = 0 + 329

Combine like terms: 0 + 329 = 329
2x + x2 = 329

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 = 329 + 1

Reorder the terms:
1 + 2x + x2 = 329 + 1

Combine like terms: 329 + 1 = 330
1 + 2x + x2 = 330

Factor a perfect square on the left side:
(x + 1)(x + 1) = 330

Calculate the square root of the right side: 18.165902125

Break this problem into two subproblems by setting 
(x + 1) equal to 18.165902125 and -18.165902125.

Subproblem 1

x + 1 = 18.165902125 Simplifying x + 1 = 18.165902125 Reorder the terms: 1 + x = 18.165902125 Solving 1 + x = 18.165902125 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 = 18.165902125 + -1 Combine like terms: 1 + -1 = 0 0 + x = 18.165902125 + -1 x = 18.165902125 + -1 Combine like terms: 18.165902125 + -1 = 17.165902125 x = 17.165902125 Simplifying x = 17.165902125

Subproblem 2

x + 1 = -18.165902125 Simplifying x + 1 = -18.165902125 Reorder the terms: 1 + x = -18.165902125 Solving 1 + x = -18.165902125 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 = -18.165902125 + -1 Combine like terms: 1 + -1 = 0 0 + x = -18.165902125 + -1 x = -18.165902125 + -1 Combine like terms: -18.165902125 + -1 = -19.165902125 x = -19.165902125 Simplifying x = -19.165902125

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.165902125, -19.165902125}

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