0.1x^2-x+9=0.2x

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Solution for 0.1x^2-x+9=0.2x equation:


Simplifying
0.1x2 + -1x + 9 = 0.2x

Reorder the terms:
9 + -1x + 0.1x2 = 0.2x

Solving
9 + -1x + 0.1x2 = 0.2x

Solving for variable 'x'.

Reorder the terms:
9 + -1x + -0.2x + 0.1x2 = 0.2x + -0.2x

Combine like terms: -1x + -0.2x = -1.2x
9 + -1.2x + 0.1x2 = 0.2x + -0.2x

Combine like terms: 0.2x + -0.2x = 0.0
9 + -1.2x + 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'.
90 + -12x + x2 = 0

Move the constant term to the right:

Add '-90' to each side of the equation.
90 + -12x + -90 + x2 = 0 + -90

Reorder the terms:
90 + -90 + -12x + x2 = 0 + -90

Combine like terms: 90 + -90 = 0
0 + -12x + x2 = 0 + -90
-12x + x2 = 0 + -90

Combine like terms: 0 + -90 = -90
-12x + x2 = -90

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = -90 + 36

Reorder the terms:
36 + -12x + x2 = -90 + 36

Combine like terms: -90 + 36 = -54
36 + -12x + x2 = -54

Factor a perfect square on the left side:
(x + -6)(x + -6) = -54

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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