.0001x^2+.02x-1.8=0

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Solution for .0001x^2+.02x-1.8=0 equation:


Simplifying
0.0001x2 + 0.02x + -1.8 = 0

Reorder the terms:
-1.8 + 0.02x + 0.0001x2 = 0

Solving
-1.8 + 0.02x + 0.0001x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
0.0001 the coefficient of the squared term: 

Divide each side by '0.0001'.
-18000 + 200x + x2 = 0

Move the constant term to the right:

Add '18000' to each side of the equation.
-18000 + 200x + 18000 + x2 = 0 + 18000

Reorder the terms:
-18000 + 18000 + 200x + x2 = 0 + 18000

Combine like terms: -18000 + 18000 = 0
0 + 200x + x2 = 0 + 18000
200x + x2 = 0 + 18000

Combine like terms: 0 + 18000 = 18000
200x + x2 = 18000

The x term is 200x.  Take half its coefficient (100).
Square it (10000) and add it to both sides.

Add '10000' to each side of the equation.
200x + 10000 + x2 = 18000 + 10000

Reorder the terms:
10000 + 200x + x2 = 18000 + 10000

Combine like terms: 18000 + 10000 = 28000
10000 + 200x + x2 = 28000

Factor a perfect square on the left side:
(x + 100)(x + 100) = 28000

Calculate the square root of the right side: 167.332005307

Break this problem into two subproblems by setting 
(x + 100) equal to 167.332005307 and -167.332005307.

Subproblem 1

x + 100 = 167.332005307 Simplifying x + 100 = 167.332005307 Reorder the terms: 100 + x = 167.332005307 Solving 100 + x = 167.332005307 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-100' to each side of the equation. 100 + -100 + x = 167.332005307 + -100 Combine like terms: 100 + -100 = 0 0 + x = 167.332005307 + -100 x = 167.332005307 + -100 Combine like terms: 167.332005307 + -100 = 67.332005307 x = 67.332005307 Simplifying x = 67.332005307

Subproblem 2

x + 100 = -167.332005307 Simplifying x + 100 = -167.332005307 Reorder the terms: 100 + x = -167.332005307 Solving 100 + x = -167.332005307 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-100' to each side of the equation. 100 + -100 + x = -167.332005307 + -100 Combine like terms: 100 + -100 = 0 0 + x = -167.332005307 + -100 x = -167.332005307 + -100 Combine like terms: -167.332005307 + -100 = -267.332005307 x = -267.332005307 Simplifying x = -267.332005307

Solution

The solution to the problem is based on the solutions from the subproblems. x = {67.332005307, -267.332005307}

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