2x^2+4x-361=0

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Solution for 2x^2+4x-361=0 equation:


Simplifying
2x2 + 4x + -361 = 0

Reorder the terms:
-361 + 4x + 2x2 = 0

Solving
-361 + 4x + 2x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-180.5 + 2x + x2 = 0

Move the constant term to the right:

Add '180.5' to each side of the equation.
-180.5 + 2x + 180.5 + x2 = 0 + 180.5

Reorder the terms:
-180.5 + 180.5 + 2x + x2 = 0 + 180.5

Combine like terms: -180.5 + 180.5 = 0.0
0.0 + 2x + x2 = 0 + 180.5
2x + x2 = 0 + 180.5

Combine like terms: 0 + 180.5 = 180.5
2x + x2 = 180.5

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 = 180.5 + 1

Reorder the terms:
1 + 2x + x2 = 180.5 + 1

Combine like terms: 180.5 + 1 = 181.5
1 + 2x + x2 = 181.5

Factor a perfect square on the left side:
(x + 1)(x + 1) = 181.5

Calculate the square root of the right side: 13.472193585

Break this problem into two subproblems by setting 
(x + 1) equal to 13.472193585 and -13.472193585.

Subproblem 1

x + 1 = 13.472193585 Simplifying x + 1 = 13.472193585 Reorder the terms: 1 + x = 13.472193585 Solving 1 + x = 13.472193585 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 = 13.472193585 + -1 Combine like terms: 1 + -1 = 0 0 + x = 13.472193585 + -1 x = 13.472193585 + -1 Combine like terms: 13.472193585 + -1 = 12.472193585 x = 12.472193585 Simplifying x = 12.472193585

Subproblem 2

x + 1 = -13.472193585 Simplifying x + 1 = -13.472193585 Reorder the terms: 1 + x = -13.472193585 Solving 1 + x = -13.472193585 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 = -13.472193585 + -1 Combine like terms: 1 + -1 = 0 0 + x = -13.472193585 + -1 x = -13.472193585 + -1 Combine like terms: -13.472193585 + -1 = -14.472193585 x = -14.472193585 Simplifying x = -14.472193585

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.472193585, -14.472193585}

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