x^2+2x=113

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Solution for x^2+2x=113 equation:


Simplifying
x2 + 2x = 113

Reorder the terms:
2x + x2 = 113

Solving
2x + x2 = 113

Solving for variable 'x'.

Reorder the terms:
-113 + 2x + x2 = 113 + -113

Combine like terms: 113 + -113 = 0
-113 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '113' to each side of the equation.
-113 + 2x + 113 + x2 = 0 + 113

Reorder the terms:
-113 + 113 + 2x + x2 = 0 + 113

Combine like terms: -113 + 113 = 0
0 + 2x + x2 = 0 + 113
2x + x2 = 0 + 113

Combine like terms: 0 + 113 = 113
2x + x2 = 113

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 = 113 + 1

Reorder the terms:
1 + 2x + x2 = 113 + 1

Combine like terms: 113 + 1 = 114
1 + 2x + x2 = 114

Factor a perfect square on the left side:
(x + 1)(x + 1) = 114

Calculate the square root of the right side: 10.677078252

Break this problem into two subproblems by setting 
(x + 1) equal to 10.677078252 and -10.677078252.

Subproblem 1

x + 1 = 10.677078252 Simplifying x + 1 = 10.677078252 Reorder the terms: 1 + x = 10.677078252 Solving 1 + x = 10.677078252 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 = 10.677078252 + -1 Combine like terms: 1 + -1 = 0 0 + x = 10.677078252 + -1 x = 10.677078252 + -1 Combine like terms: 10.677078252 + -1 = 9.677078252 x = 9.677078252 Simplifying x = 9.677078252

Subproblem 2

x + 1 = -10.677078252 Simplifying x + 1 = -10.677078252 Reorder the terms: 1 + x = -10.677078252 Solving 1 + x = -10.677078252 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 = -10.677078252 + -1 Combine like terms: 1 + -1 = 0 0 + x = -10.677078252 + -1 x = -10.677078252 + -1 Combine like terms: -10.677078252 + -1 = -11.677078252 x = -11.677078252 Simplifying x = -11.677078252

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.677078252, -11.677078252}

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