X^2+2X=320

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Solution for X^2+2X=320 equation:


Simplifying
X2 + 2X = 320

Reorder the terms:
2X + X2 = 320

Solving
2X + X2 = 320

Solving for variable 'X'.

Reorder the terms:
-320 + 2X + X2 = 320 + -320

Combine like terms: 320 + -320 = 0
-320 + 2X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '320' to each side of the equation.
-320 + 2X + 320 + X2 = 0 + 320

Reorder the terms:
-320 + 320 + 2X + X2 = 0 + 320

Combine like terms: -320 + 320 = 0
0 + 2X + X2 = 0 + 320
2X + X2 = 0 + 320

Combine like terms: 0 + 320 = 320
2X + X2 = 320

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 = 320 + 1

Reorder the terms:
1 + 2X + X2 = 320 + 1

Combine like terms: 320 + 1 = 321
1 + 2X + X2 = 321

Factor a perfect square on the left side:
(X + 1)(X + 1) = 321

Calculate the square root of the right side: 17.916472867

Break this problem into two subproblems by setting 
(X + 1) equal to 17.916472867 and -17.916472867.

Subproblem 1

X + 1 = 17.916472867 Simplifying X + 1 = 17.916472867 Reorder the terms: 1 + X = 17.916472867 Solving 1 + X = 17.916472867 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 = 17.916472867 + -1 Combine like terms: 1 + -1 = 0 0 + X = 17.916472867 + -1 X = 17.916472867 + -1 Combine like terms: 17.916472867 + -1 = 16.916472867 X = 16.916472867 Simplifying X = 16.916472867

Subproblem 2

X + 1 = -17.916472867 Simplifying X + 1 = -17.916472867 Reorder the terms: 1 + X = -17.916472867 Solving 1 + X = -17.916472867 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 = -17.916472867 + -1 Combine like terms: 1 + -1 = 0 0 + X = -17.916472867 + -1 X = -17.916472867 + -1 Combine like terms: -17.916472867 + -1 = -18.916472867 X = -18.916472867 Simplifying X = -18.916472867

Solution

The solution to the problem is based on the solutions from the subproblems. X = {16.916472867, -18.916472867}

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