2x^2+5x-361=0

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Solution for 2x^2+5x-361=0 equation:


Simplifying
2x2 + 5x + -361 = 0

Reorder the terms:
-361 + 5x + 2x2 = 0

Solving
-361 + 5x + 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 + 2.5x + x2 = 0

Move the constant term to the right:

Add '180.5' to each side of the equation.
-180.5 + 2.5x + 180.5 + x2 = 0 + 180.5

Reorder the terms:
-180.5 + 180.5 + 2.5x + x2 = 0 + 180.5

Combine like terms: -180.5 + 180.5 = 0.0
0.0 + 2.5x + x2 = 0 + 180.5
2.5x + x2 = 0 + 180.5

Combine like terms: 0 + 180.5 = 180.5
2.5x + x2 = 180.5

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 180.5 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 180.5 + 1.5625

Combine like terms: 180.5 + 1.5625 = 182.0625
1.5625 + 2.5x + x2 = 182.0625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 182.0625

Calculate the square root of the right side: 13.493053769

Break this problem into two subproblems by setting 
(x + 1.25) equal to 13.493053769 and -13.493053769.

Subproblem 1

x + 1.25 = 13.493053769 Simplifying x + 1.25 = 13.493053769 Reorder the terms: 1.25 + x = 13.493053769 Solving 1.25 + x = 13.493053769 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 13.493053769 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 13.493053769 + -1.25 x = 13.493053769 + -1.25 Combine like terms: 13.493053769 + -1.25 = 12.243053769 x = 12.243053769 Simplifying x = 12.243053769

Subproblem 2

x + 1.25 = -13.493053769 Simplifying x + 1.25 = -13.493053769 Reorder the terms: 1.25 + x = -13.493053769 Solving 1.25 + x = -13.493053769 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -13.493053769 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -13.493053769 + -1.25 x = -13.493053769 + -1.25 Combine like terms: -13.493053769 + -1.25 = -14.743053769 x = -14.743053769 Simplifying x = -14.743053769

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.243053769, -14.743053769}

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