-1.8+.05x+.0001x^2=0

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Solution for -1.8+.05x+.0001x^2=0 equation:


Simplifying
-1.8 + 0.05x + 0.0001x2 = 0

Solving
-1.8 + 0.05x + 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 + 500x + x2 = 0

Move the constant term to the right:

Add '18000' to each side of the equation.
-18000 + 500x + 18000 + x2 = 0 + 18000

Reorder the terms:
-18000 + 18000 + 500x + x2 = 0 + 18000

Combine like terms: -18000 + 18000 = 0
0 + 500x + x2 = 0 + 18000
500x + x2 = 0 + 18000

Combine like terms: 0 + 18000 = 18000
500x + x2 = 18000

The x term is 500x.  Take half its coefficient (250).
Square it (62500) and add it to both sides.

Add '62500' to each side of the equation.
500x + 62500 + x2 = 18000 + 62500

Reorder the terms:
62500 + 500x + x2 = 18000 + 62500

Combine like terms: 18000 + 62500 = 80500
62500 + 500x + x2 = 80500

Factor a perfect square on the left side:
(x + 250)(x + 250) = 80500

Calculate the square root of the right side: 283.725219182

Break this problem into two subproblems by setting 
(x + 250) equal to 283.725219182 and -283.725219182.

Subproblem 1

x + 250 = 283.725219182 Simplifying x + 250 = 283.725219182 Reorder the terms: 250 + x = 283.725219182 Solving 250 + x = 283.725219182 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-250' to each side of the equation. 250 + -250 + x = 283.725219182 + -250 Combine like terms: 250 + -250 = 0 0 + x = 283.725219182 + -250 x = 283.725219182 + -250 Combine like terms: 283.725219182 + -250 = 33.725219182 x = 33.725219182 Simplifying x = 33.725219182

Subproblem 2

x + 250 = -283.725219182 Simplifying x + 250 = -283.725219182 Reorder the terms: 250 + x = -283.725219182 Solving 250 + x = -283.725219182 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-250' to each side of the equation. 250 + -250 + x = -283.725219182 + -250 Combine like terms: 250 + -250 = 0 0 + x = -283.725219182 + -250 x = -283.725219182 + -250 Combine like terms: -283.725219182 + -250 = -533.725219182 x = -533.725219182 Simplifying x = -533.725219182

Solution

The solution to the problem is based on the solutions from the subproblems. x = {33.725219182, -533.725219182}

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