4x^2+129x-360=0

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Solution for 4x^2+129x-360=0 equation:


Simplifying
4x2 + 129x + -360 = 0

Reorder the terms:
-360 + 129x + 4x2 = 0

Solving
-360 + 129x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-90 + 32.25x + x2 = 0

Move the constant term to the right:

Add '90' to each side of the equation.
-90 + 32.25x + 90 + x2 = 0 + 90

Reorder the terms:
-90 + 90 + 32.25x + x2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + 32.25x + x2 = 0 + 90
32.25x + x2 = 0 + 90

Combine like terms: 0 + 90 = 90
32.25x + x2 = 90

The x term is 32.25x.  Take half its coefficient (16.125).
Square it (260.015625) and add it to both sides.

Add '260.015625' to each side of the equation.
32.25x + 260.015625 + x2 = 90 + 260.015625

Reorder the terms:
260.015625 + 32.25x + x2 = 90 + 260.015625

Combine like terms: 90 + 260.015625 = 350.015625
260.015625 + 32.25x + x2 = 350.015625

Factor a perfect square on the left side:
(x + 16.125)(x + 16.125) = 350.015625

Calculate the square root of the right side: 18.708704525

Break this problem into two subproblems by setting 
(x + 16.125) equal to 18.708704525 and -18.708704525.

Subproblem 1

x + 16.125 = 18.708704525 Simplifying x + 16.125 = 18.708704525 Reorder the terms: 16.125 + x = 18.708704525 Solving 16.125 + x = 18.708704525 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-16.125' to each side of the equation. 16.125 + -16.125 + x = 18.708704525 + -16.125 Combine like terms: 16.125 + -16.125 = 0.000 0.000 + x = 18.708704525 + -16.125 x = 18.708704525 + -16.125 Combine like terms: 18.708704525 + -16.125 = 2.583704525 x = 2.583704525 Simplifying x = 2.583704525

Subproblem 2

x + 16.125 = -18.708704525 Simplifying x + 16.125 = -18.708704525 Reorder the terms: 16.125 + x = -18.708704525 Solving 16.125 + x = -18.708704525 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-16.125' to each side of the equation. 16.125 + -16.125 + x = -18.708704525 + -16.125 Combine like terms: 16.125 + -16.125 = 0.000 0.000 + x = -18.708704525 + -16.125 x = -18.708704525 + -16.125 Combine like terms: -18.708704525 + -16.125 = -34.833704525 x = -34.833704525 Simplifying x = -34.833704525

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.583704525, -34.833704525}

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