.00004-.0004x-4x^2=0

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Solution for .00004-.0004x-4x^2=0 equation:


Simplifying
0.00004 + -0.0004x + -4x2 = 0

Solving
0.00004 + -0.0004x + -4x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-0.00001 + 0.0001x + x2 = 0

Move the constant term to the right:

Add '0.00001' to each side of the equation.
-0.00001 + 0.0001x + 0.00001 + x2 = 0 + 0.00001

Reorder the terms:
-0.00001 + 0.00001 + 0.0001x + x2 = 0 + 0.00001

Combine like terms: -0.00001 + 0.00001 = 0.00000
0.00000 + 0.0001x + x2 = 0 + 0.00001
0.0001x + x2 = 0 + 0.00001

Combine like terms: 0 + 0.00001 = 0.00001
0.0001x + x2 = 0.00001

The x term is 0.0001x.  Take half its coefficient (0.00005).
Square it (0.0000000025) and add it to both sides.

Add '0.0000000025' to each side of the equation.
0.0001x + 0.0000000025 + x2 = 0.00001 + 0.0000000025

Reorder the terms:
0.0000000025 + 0.0001x + x2 = 0.00001 + 0.0000000025

Combine like terms: 0.00001 + 0.0000000025 = 0.0000100025
0.0000000025 + 0.0001x + x2 = 0.0000100025

Factor a perfect square on the left side:
(x + 0.00005)(x + 0.00005) = 0.0000100025

Calculate the square root of the right side: 0.003162673

Break this problem into two subproblems by setting 
(x + 0.00005) equal to 0.003162673 and -0.003162673.

Subproblem 1

x + 0.00005 = 0.003162673 Simplifying x + 0.00005 = 0.003162673 Reorder the terms: 0.00005 + x = 0.003162673 Solving 0.00005 + x = 0.003162673 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.00005' to each side of the equation. 0.00005 + -0.00005 + x = 0.003162673 + -0.00005 Combine like terms: 0.00005 + -0.00005 = 0.00000 0.00000 + x = 0.003162673 + -0.00005 x = 0.003162673 + -0.00005 Combine like terms: 0.003162673 + -0.00005 = 0.003112673 x = 0.003112673 Simplifying x = 0.003112673

Subproblem 2

x + 0.00005 = -0.003162673 Simplifying x + 0.00005 = -0.003162673 Reorder the terms: 0.00005 + x = -0.003162673 Solving 0.00005 + x = -0.003162673 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.00005' to each side of the equation. 0.00005 + -0.00005 + x = -0.003162673 + -0.00005 Combine like terms: 0.00005 + -0.00005 = 0.00000 0.00000 + x = -0.003162673 + -0.00005 x = -0.003162673 + -0.00005 Combine like terms: -0.003162673 + -0.00005 = -0.003212673 x = -0.003212673 Simplifying x = -0.003212673

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.003112673, -0.003212673}

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