x^2+2x=324

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Solution for x^2+2x=324 equation:


Simplifying
x2 + 2x = 324

Reorder the terms:
2x + x2 = 324

Solving
2x + x2 = 324

Solving for variable 'x'.

Reorder the terms:
-324 + 2x + x2 = 324 + -324

Combine like terms: 324 + -324 = 0
-324 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '324' to each side of the equation.
-324 + 2x + 324 + x2 = 0 + 324

Reorder the terms:
-324 + 324 + 2x + x2 = 0 + 324

Combine like terms: -324 + 324 = 0
0 + 2x + x2 = 0 + 324
2x + x2 = 0 + 324

Combine like terms: 0 + 324 = 324
2x + x2 = 324

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 = 324 + 1

Reorder the terms:
1 + 2x + x2 = 324 + 1

Combine like terms: 324 + 1 = 325
1 + 2x + x2 = 325

Factor a perfect square on the left side:
(x + 1)(x + 1) = 325

Calculate the square root of the right side: 18.027756377

Break this problem into two subproblems by setting 
(x + 1) equal to 18.027756377 and -18.027756377.

Subproblem 1

x + 1 = 18.027756377 Simplifying x + 1 = 18.027756377 Reorder the terms: 1 + x = 18.027756377 Solving 1 + x = 18.027756377 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 = 18.027756377 + -1 Combine like terms: 1 + -1 = 0 0 + x = 18.027756377 + -1 x = 18.027756377 + -1 Combine like terms: 18.027756377 + -1 = 17.027756377 x = 17.027756377 Simplifying x = 17.027756377

Subproblem 2

x + 1 = -18.027756377 Simplifying x + 1 = -18.027756377 Reorder the terms: 1 + x = -18.027756377 Solving 1 + x = -18.027756377 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 = -18.027756377 + -1 Combine like terms: 1 + -1 = 0 0 + x = -18.027756377 + -1 x = -18.027756377 + -1 Combine like terms: -18.027756377 + -1 = -19.027756377 x = -19.027756377 Simplifying x = -19.027756377

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.027756377, -19.027756377}

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