x+3x(x+5000)=40000

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Solution for x+3x(x+5000)=40000 equation:


Simplifying
x + 3x(x + 5000) = 40000

Reorder the terms:
x + 3x(5000 + x) = 40000
x + (5000 * 3x + x * 3x) = 40000
x + (15000x + 3x2) = 40000

Combine like terms: x + 15000x = 15001x
15001x + 3x2 = 40000

Solving
15001x + 3x2 = 40000

Solving for variable 'x'.

Reorder the terms:
-40000 + 15001x + 3x2 = 40000 + -40000

Combine like terms: 40000 + -40000 = 0
-40000 + 15001x + 3x2 = 0

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

Divide each side by '3'.
-13333.33333 + 5000.333333x + x2 = 0

Move the constant term to the right:

Add '13333.33333' to each side of the equation.
-13333.33333 + 5000.333333x + 13333.33333 + x2 = 0 + 13333.33333

Reorder the terms:
-13333.33333 + 13333.33333 + 5000.333333x + x2 = 0 + 13333.33333

Combine like terms: -13333.33333 + 13333.33333 = 0.00000
0.00000 + 5000.333333x + x2 = 0 + 13333.33333
5000.333333x + x2 = 0 + 13333.33333

Combine like terms: 0 + 13333.33333 = 13333.33333
5000.333333x + x2 = 13333.33333

The x term is 5000.333333x.  Take half its coefficient (2500.166667).
Square it (6250833.363) and add it to both sides.

Add '6250833.363' to each side of the equation.
5000.333333x + 6250833.363 + x2 = 13333.33333 + 6250833.363

Reorder the terms:
6250833.363 + 5000.333333x + x2 = 13333.33333 + 6250833.363

Combine like terms: 13333.33333 + 6250833.363 = 6264166.69633
6250833.363 + 5000.333333x + x2 = 6264166.69633

Factor a perfect square on the left side:
(x + 2500.166667)(x + 2500.166667) = 6264166.69633

Calculate the square root of the right side: 2502.831735521

Break this problem into two subproblems by setting 
(x + 2500.166667) equal to 2502.831735521 and -2502.831735521.

Subproblem 1

x + 2500.166667 = 2502.831735521 Simplifying x + 2500.166667 = 2502.831735521 Reorder the terms: 2500.166667 + x = 2502.831735521 Solving 2500.166667 + x = 2502.831735521 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2500.166667' to each side of the equation. 2500.166667 + -2500.166667 + x = 2502.831735521 + -2500.166667 Combine like terms: 2500.166667 + -2500.166667 = 0.000000 0.000000 + x = 2502.831735521 + -2500.166667 x = 2502.831735521 + -2500.166667 Combine like terms: 2502.831735521 + -2500.166667 = 2.665068521 x = 2.665068521 Simplifying x = 2.665068521

Subproblem 2

x + 2500.166667 = -2502.831735521 Simplifying x + 2500.166667 = -2502.831735521 Reorder the terms: 2500.166667 + x = -2502.831735521 Solving 2500.166667 + x = -2502.831735521 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2500.166667' to each side of the equation. 2500.166667 + -2500.166667 + x = -2502.831735521 + -2500.166667 Combine like terms: 2500.166667 + -2500.166667 = 0.000000 0.000000 + x = -2502.831735521 + -2500.166667 x = -2502.831735521 + -2500.166667 Combine like terms: -2502.831735521 + -2500.166667 = -5002.998402521 x = -5002.998402521 Simplifying x = -5002.998402521

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.665068521, -5002.998402521}

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