0.0002x^2-20000x+400000=0

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Solution for 0.0002x^2-20000x+400000=0 equation:


Simplifying
0.0002x2 + -20000x + 400000 = 0

Reorder the terms:
400000 + -20000x + 0.0002x2 = 0

Solving
400000 + -20000x + 0.0002x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
0.0002 the coefficient of the squared term: 

Divide each side by '0.0002'.
2000000000 + -100000000x + x2 = 0

Move the constant term to the right:

Add '-2000000000' to each side of the equation.
2000000000 + -100000000x + -2000000000 + x2 = 0 + -2000000000

Reorder the terms:
2000000000 + -2000000000 + -100000000x + x2 = 0 + -2000000000

Combine like terms: 2000000000 + -2000000000 = 0
0 + -100000000x + x2 = 0 + -2000000000
-100000000x + x2 = 0 + -2000000000

Combine like terms: 0 + -2000000000 = -2000000000
-100000000x + x2 = -2000000000

The x term is -100000000x.  Take half its coefficient (-50000000).
Square it (2500000000000000) and add it to both sides.

Add '2500000000000000' to each side of the equation.
-100000000x + 2500000000000000 + x2 = -2000000000 + 2500000000000000

Reorder the terms:
2500000000000000 + -100000000x + x2 = -2000000000 + 2500000000000000

Combine like terms: -2000000000 + 2500000000000000 = 2499998000000000
2500000000000000 + -100000000x + x2 = 2499998000000000

Factor a perfect square on the left side:
(x + -50000000)(x + -50000000) = 2499998000000000

Calculate the square root of the right side: 49999979.999996

Break this problem into two subproblems by setting 
(x + -50000000) equal to 49999979.999996 and -49999979.999996.

Subproblem 1

x + -50000000 = 49999979.999996 Simplifying x + -50000000 = 49999979.999996 Reorder the terms: -50000000 + x = 49999979.999996 Solving -50000000 + x = 49999979.999996 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50000000' to each side of the equation. -50000000 + 50000000 + x = 49999979.999996 + 50000000 Combine like terms: -50000000 + 50000000 = 0 0 + x = 49999979.999996 + 50000000 x = 49999979.999996 + 50000000 Combine like terms: 49999979.999996 + 50000000 = 99999979.999996 x = 99999979.999996 Simplifying x = 99999979.999996

Subproblem 2

x + -50000000 = -49999979.999996 Simplifying x + -50000000 = -49999979.999996 Reorder the terms: -50000000 + x = -49999979.999996 Solving -50000000 + x = -49999979.999996 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50000000' to each side of the equation. -50000000 + 50000000 + x = -49999979.999996 + 50000000 Combine like terms: -50000000 + 50000000 = 0 0 + x = -49999979.999996 + 50000000 x = -49999979.999996 + 50000000 Combine like terms: -49999979.999996 + 50000000 = 20.000004 x = 20.000004 Simplifying x = 20.000004

Solution

The solution to the problem is based on the solutions from the subproblems. x = {99999979.999996, 20.000004}

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