0=450+0.1x^2-0.2x

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Solution for 0=450+0.1x^2-0.2x equation:


Simplifying
0 = 450 + 0.1x2 + -0.2x

Reorder the terms:
0 = 450 + -0.2x + 0.1x2

Solving
0 = 450 + -0.2x + 0.1x2

Solving for variable 'x'.

Combine like terms: 0 + -450 = -450
-450 + 0.2x + -0.1x2 = 450 + -0.2x + 0.1x2 + -450 + 0.2x + -0.1x2

Reorder the terms:
-450 + 0.2x + -0.1x2 = 450 + -450 + -0.2x + 0.2x + 0.1x2 + -0.1x2

Combine like terms: 450 + -450 = 0
-450 + 0.2x + -0.1x2 = 0 + -0.2x + 0.2x + 0.1x2 + -0.1x2
-450 + 0.2x + -0.1x2 = -0.2x + 0.2x + 0.1x2 + -0.1x2

Combine like terms: -0.2x + 0.2x = 0.0
-450 + 0.2x + -0.1x2 = 0.0 + 0.1x2 + -0.1x2
-450 + 0.2x + -0.1x2 = 0.1x2 + -0.1x2

Combine like terms: 0.1x2 + -0.1x2 = 0.0
-450 + 0.2x + -0.1x2 = 0.0

Begin completing the square.  Divide all terms by
-0.1 the coefficient of the squared term: 

Divide each side by '-0.1'.
4500 + -2x + x2 = 0

Move the constant term to the right:

Add '-4500' to each side of the equation.
4500 + -2x + -4500 + x2 = 0 + -4500

Reorder the terms:
4500 + -4500 + -2x + x2 = 0 + -4500

Combine like terms: 4500 + -4500 = 0
0 + -2x + x2 = 0 + -4500
-2x + x2 = 0 + -4500

Combine like terms: 0 + -4500 = -4500
-2x + x2 = -4500

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = -4500 + 1

Reorder the terms:
1 + -2x + x2 = -4500 + 1

Combine like terms: -4500 + 1 = -4499
1 + -2x + x2 = -4499

Factor a perfect square on the left side:
(x + -1)(x + -1) = -4499

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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