x^2+2x-342=0

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Solution for x^2+2x-342=0 equation:


Simplifying
x2 + 2x + -342 = 0

Reorder the terms:
-342 + 2x + x2 = 0

Solving
-342 + 2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '342' to each side of the equation.
-342 + 2x + 342 + x2 = 0 + 342

Reorder the terms:
-342 + 342 + 2x + x2 = 0 + 342

Combine like terms: -342 + 342 = 0
0 + 2x + x2 = 0 + 342
2x + x2 = 0 + 342

Combine like terms: 0 + 342 = 342
2x + x2 = 342

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 = 342 + 1

Reorder the terms:
1 + 2x + x2 = 342 + 1

Combine like terms: 342 + 1 = 343
1 + 2x + x2 = 343

Factor a perfect square on the left side:
(x + 1)(x + 1) = 343

Calculate the square root of the right side: 18.520259177

Break this problem into two subproblems by setting 
(x + 1) equal to 18.520259177 and -18.520259177.

Subproblem 1

x + 1 = 18.520259177 Simplifying x + 1 = 18.520259177 Reorder the terms: 1 + x = 18.520259177 Solving 1 + x = 18.520259177 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 = 18.520259177 + -1 Combine like terms: 1 + -1 = 0 0 + x = 18.520259177 + -1 x = 18.520259177 + -1 Combine like terms: 18.520259177 + -1 = 17.520259177 x = 17.520259177 Simplifying x = 17.520259177

Subproblem 2

x + 1 = -18.520259177 Simplifying x + 1 = -18.520259177 Reorder the terms: 1 + x = -18.520259177 Solving 1 + x = -18.520259177 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 = -18.520259177 + -1 Combine like terms: 1 + -1 = 0 0 + x = -18.520259177 + -1 x = -18.520259177 + -1 Combine like terms: -18.520259177 + -1 = -19.520259177 x = -19.520259177 Simplifying x = -19.520259177

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.520259177, -19.520259177}

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