5x^2+12x-2160=0

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Solution for 5x^2+12x-2160=0 equation:


Simplifying
5x2 + 12x + -2160 = 0

Reorder the terms:
-2160 + 12x + 5x2 = 0

Solving
-2160 + 12x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-432 + 2.4x + x2 = 0

Move the constant term to the right:

Add '432' to each side of the equation.
-432 + 2.4x + 432 + x2 = 0 + 432

Reorder the terms:
-432 + 432 + 2.4x + x2 = 0 + 432

Combine like terms: -432 + 432 = 0
0 + 2.4x + x2 = 0 + 432
2.4x + x2 = 0 + 432

Combine like terms: 0 + 432 = 432
2.4x + x2 = 432

The x term is 2.4x.  Take half its coefficient (1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
2.4x + 1.44 + x2 = 432 + 1.44

Reorder the terms:
1.44 + 2.4x + x2 = 432 + 1.44

Combine like terms: 432 + 1.44 = 433.44
1.44 + 2.4x + x2 = 433.44

Factor a perfect square on the left side:
(x + 1.2)(x + 1.2) = 433.44

Calculate the square root of the right side: 20.819221887

Break this problem into two subproblems by setting 
(x + 1.2) equal to 20.819221887 and -20.819221887.

Subproblem 1

x + 1.2 = 20.819221887 Simplifying x + 1.2 = 20.819221887 Reorder the terms: 1.2 + x = 20.819221887 Solving 1.2 + x = 20.819221887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = 20.819221887 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = 20.819221887 + -1.2 x = 20.819221887 + -1.2 Combine like terms: 20.819221887 + -1.2 = 19.619221887 x = 19.619221887 Simplifying x = 19.619221887

Subproblem 2

x + 1.2 = -20.819221887 Simplifying x + 1.2 = -20.819221887 Reorder the terms: 1.2 + x = -20.819221887 Solving 1.2 + x = -20.819221887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = -20.819221887 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = -20.819221887 + -1.2 x = -20.819221887 + -1.2 Combine like terms: -20.819221887 + -1.2 = -22.019221887 x = -22.019221887 Simplifying x = -22.019221887

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.619221887, -22.019221887}

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