0.9Q^2-2Q+100=0

Solution for 0.9Q^2-2Q+100=0 equation:

Simplifying
0.9Q2 + -2Q + 100 = 0

Reorder the terms:
100 + -2Q + 0.9Q2 = 0

Solving
100 + -2Q + 0.9Q2 = 0

Solving for variable 'Q'.

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

Divide each side by '0.9'.
111.1111111 + -2.222222222Q + Q2 = 0

Move the constant term to the right:

Add '-111.1111111' to each side of the equation.
111.1111111 + -2.222222222Q + -111.1111111 + Q2 = 0 + -111.1111111

Reorder the terms:
111.1111111 + -111.1111111 + -2.222222222Q + Q2 = 0 + -111.1111111

Combine like terms: 111.1111111 + -111.1111111 = 0.0000000
0.0000000 + -2.222222222Q + Q2 = 0 + -111.1111111
-2.222222222Q + Q2 = 0 + -111.1111111

Combine like terms: 0 + -111.1111111 = -111.1111111
-2.222222222Q + Q2 = -111.1111111

The Q term is -2.222222222Q.  Take half its coefficient (-1.111111111).
Square it (1.234567901) and add it to both sides.

Add '1.234567901' to each side of the equation.
-2.222222222Q + 1.234567901 + Q2 = -111.1111111 + 1.234567901

Reorder the terms:
1.234567901 + -2.222222222Q + Q2 = -111.1111111 + 1.234567901

Combine like terms: -111.1111111 + 1.234567901 = -109.876543199
1.234567901 + -2.222222222Q + Q2 = -109.876543199

Factor a perfect square on the left side:
(Q + -1.111111111)(Q + -1.111111111) = -109.876543199

Can't calculate square root of the right side.

The solution to this equation could not be determined.