.38=x(1000000+x)

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Solution for .38=x(1000000+x) equation:


Simplifying
0.38 = x(1000000 + x)
0.38 = (1000000 * x + x * x)
0.38 = (1000000x + x2)

Solving
0.38 = 1000000x + x2

Solving for variable 'x'.

Reorder the terms:
0.38 + -1000000x + -1x2 = 1000000x + -1000000x + x2 + -1x2

Combine like terms: 1000000x + -1000000x = 0
0.38 + -1000000x + -1x2 = 0 + x2 + -1x2
0.38 + -1000000x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
0.38 + -1000000x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-0.38 + 1000000x + x2 = 0

Move the constant term to the right:

Add '0.38' to each side of the equation.
-0.38 + 1000000x + 0.38 + x2 = 0 + 0.38

Reorder the terms:
-0.38 + 0.38 + 1000000x + x2 = 0 + 0.38

Combine like terms: -0.38 + 0.38 = 0.00
0.00 + 1000000x + x2 = 0 + 0.38
1000000x + x2 = 0 + 0.38

Combine like terms: 0 + 0.38 = 0.38
1000000x + x2 = 0.38

The x term is 1000000x.  Take half its coefficient (500000).
Square it (250000000000) and add it to both sides.

Add '250000000000' to each side of the equation.
1000000x + 250000000000 + x2 = 0.38 + 250000000000

Reorder the terms:
250000000000 + 1000000x + x2 = 0.38 + 250000000000

Combine like terms: 0.38 + 250000000000 = 250000000000.38
250000000000 + 1000000x + x2 = 250000000000.38

Factor a perfect square on the left side:
(x + 500000)(x + 500000) = 250000000000.38

Calculate the square root of the right side: 500000.00000038

Break this problem into two subproblems by setting 
(x + 500000) equal to 500000.00000038 and -500000.00000038.

Subproblem 1

x + 500000 = 500000.00000038 Simplifying x + 500000 = 500000.00000038 Reorder the terms: 500000 + x = 500000.00000038 Solving 500000 + x = 500000.00000038 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-500000' to each side of the equation. 500000 + -500000 + x = 500000.00000038 + -500000 Combine like terms: 500000 + -500000 = 0 0 + x = 500000.00000038 + -500000 x = 500000.00000038 + -500000 Combine like terms: 500000.00000038 + -500000 = 0.00000038 x = 0.00000038 Simplifying x = 0.00000038

Subproblem 2

x + 500000 = -500000.00000038 Simplifying x + 500000 = -500000.00000038 Reorder the terms: 500000 + x = -500000.00000038 Solving 500000 + x = -500000.00000038 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-500000' to each side of the equation. 500000 + -500000 + x = -500000.00000038 + -500000 Combine like terms: 500000 + -500000 = 0 0 + x = -500000.00000038 + -500000 x = -500000.00000038 + -500000 Combine like terms: -500000.00000038 + -500000 = -1000000.00000038 x = -1000000.00000038 Simplifying x = -1000000.00000038

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.00000038, -1000000.00000038}

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