x^2+400x-40000=0

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Solution for x^2+400x-40000=0 equation:


Simplifying
x2 + 400x + -40000 = 0

Reorder the terms:
-40000 + 400x + x2 = 0

Solving
-40000 + 400x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '40000' to each side of the equation.
-40000 + 400x + 40000 + x2 = 0 + 40000

Reorder the terms:
-40000 + 40000 + 400x + x2 = 0 + 40000

Combine like terms: -40000 + 40000 = 0
0 + 400x + x2 = 0 + 40000
400x + x2 = 0 + 40000

Combine like terms: 0 + 40000 = 40000
400x + x2 = 40000

The x term is 400x.  Take half its coefficient (200).
Square it (40000) and add it to both sides.

Add '40000' to each side of the equation.
400x + 40000 + x2 = 40000 + 40000

Reorder the terms:
40000 + 400x + x2 = 40000 + 40000

Combine like terms: 40000 + 40000 = 80000
40000 + 400x + x2 = 80000

Factor a perfect square on the left side:
(x + 200)(x + 200) = 80000

Calculate the square root of the right side: 282.842712475

Break this problem into two subproblems by setting 
(x + 200) equal to 282.842712475 and -282.842712475.

Subproblem 1

x + 200 = 282.842712475 Simplifying x + 200 = 282.842712475 Reorder the terms: 200 + x = 282.842712475 Solving 200 + x = 282.842712475 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-200' to each side of the equation. 200 + -200 + x = 282.842712475 + -200 Combine like terms: 200 + -200 = 0 0 + x = 282.842712475 + -200 x = 282.842712475 + -200 Combine like terms: 282.842712475 + -200 = 82.842712475 x = 82.842712475 Simplifying x = 82.842712475

Subproblem 2

x + 200 = -282.842712475 Simplifying x + 200 = -282.842712475 Reorder the terms: 200 + x = -282.842712475 Solving 200 + x = -282.842712475 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-200' to each side of the equation. 200 + -200 + x = -282.842712475 + -200 Combine like terms: 200 + -200 = 0 0 + x = -282.842712475 + -200 x = -282.842712475 + -200 Combine like terms: -282.842712475 + -200 = -482.842712475 x = -482.842712475 Simplifying x = -482.842712475

Solution

The solution to the problem is based on the solutions from the subproblems. x = {82.842712475, -482.842712475}

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