3*x^2+125*x-4000=0

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Solution for 3*x^2+125*x-4000=0 equation:


Simplifying
3x2 + 125x + -4000 = 0

Reorder the terms:
-4000 + 125x + 3x2 = 0

Solving
-4000 + 125x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-1333.333333 + 41.66666667x + x2 = 0

Move the constant term to the right:

Add '1333.333333' to each side of the equation.
-1333.333333 + 41.66666667x + 1333.333333 + x2 = 0 + 1333.333333

Reorder the terms:
-1333.333333 + 1333.333333 + 41.66666667x + x2 = 0 + 1333.333333

Combine like terms: -1333.333333 + 1333.333333 = 0.000000
0.000000 + 41.66666667x + x2 = 0 + 1333.333333
41.66666667x + x2 = 0 + 1333.333333

Combine like terms: 0 + 1333.333333 = 1333.333333
41.66666667x + x2 = 1333.333333

The x term is 41.66666667x.  Take half its coefficient (20.83333334).
Square it (434.0277781) and add it to both sides.

Add '434.0277781' to each side of the equation.
41.66666667x + 434.0277781 + x2 = 1333.333333 + 434.0277781

Reorder the terms:
434.0277781 + 41.66666667x + x2 = 1333.333333 + 434.0277781

Combine like terms: 1333.333333 + 434.0277781 = 1767.3611111
434.0277781 + 41.66666667x + x2 = 1767.3611111

Factor a perfect square on the left side:
(x + 20.83333334)(x + 20.83333334) = 1767.3611111

Calculate the square root of the right side: 42.039994185

Break this problem into two subproblems by setting 
(x + 20.83333334) equal to 42.039994185 and -42.039994185.

Subproblem 1

x + 20.83333334 = 42.039994185 Simplifying x + 20.83333334 = 42.039994185 Reorder the terms: 20.83333334 + x = 42.039994185 Solving 20.83333334 + x = 42.039994185 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20.83333334' to each side of the equation. 20.83333334 + -20.83333334 + x = 42.039994185 + -20.83333334 Combine like terms: 20.83333334 + -20.83333334 = 0.00000000 0.00000000 + x = 42.039994185 + -20.83333334 x = 42.039994185 + -20.83333334 Combine like terms: 42.039994185 + -20.83333334 = 21.206660845 x = 21.206660845 Simplifying x = 21.206660845

Subproblem 2

x + 20.83333334 = -42.039994185 Simplifying x + 20.83333334 = -42.039994185 Reorder the terms: 20.83333334 + x = -42.039994185 Solving 20.83333334 + x = -42.039994185 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20.83333334' to each side of the equation. 20.83333334 + -20.83333334 + x = -42.039994185 + -20.83333334 Combine like terms: 20.83333334 + -20.83333334 = 0.00000000 0.00000000 + x = -42.039994185 + -20.83333334 x = -42.039994185 + -20.83333334 Combine like terms: -42.039994185 + -20.83333334 = -62.873327525 x = -62.873327525 Simplifying x = -62.873327525

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.206660845, -62.873327525}

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