0.001x^2-0.003x=0.004

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Solution for 0.001x^2-0.003x=0.004 equation:


Simplifying
0.001x2 + -0.003x = 0.004

Reorder the terms:
-0.003x + 0.001x2 = 0.004

Solving
-0.003x + 0.001x2 = 0.004

Solving for variable 'x'.

Reorder the terms:
-0.004 + -0.003x + 0.001x2 = 0.004 + -0.004

Combine like terms: 0.004 + -0.004 = 0.000
-0.004 + -0.003x + 0.001x2 = 0.000

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

Divide each side by '0.001'.
-4 + -3x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -3x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + -3x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -3x + x2 = 0 + 4
-3x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
-3x + x2 = 4

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 4 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 4 + 2.25

Combine like terms: 4 + 2.25 = 6.25
2.25 + -3x + x2 = 6.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 6.25

Calculate the square root of the right side: 2.5

Break this problem into two subproblems by setting 
(x + -1.5) equal to 2.5 and -2.5.

Subproblem 1

x + -1.5 = 2.5 Simplifying x + -1.5 = 2.5 Reorder the terms: -1.5 + x = 2.5 Solving -1.5 + x = 2.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 2.5 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 2.5 + 1.5 x = 2.5 + 1.5 Combine like terms: 2.5 + 1.5 = 4 x = 4 Simplifying x = 4

Subproblem 2

x + -1.5 = -2.5 Simplifying x + -1.5 = -2.5 Reorder the terms: -1.5 + x = -2.5 Solving -1.5 + x = -2.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -2.5 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -2.5 + 1.5 x = -2.5 + 1.5 Combine like terms: -2.5 + 1.5 = -1 x = -1 Simplifying x = -1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4, -1}

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