0=.43x-.018x^2-21.7

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Solution for 0=.43x-.018x^2-21.7 equation:


Simplifying
0 = 0.43x + -0.018x2 + -21.7

Reorder the terms:
0 = -21.7 + 0.43x + -0.018x2

Solving
0 = -21.7 + 0.43x + -0.018x2

Solving for variable 'x'.

Combine like terms: 0 + 21.7 = 21.7
21.7 + -0.43x + 0.018x2 = -21.7 + 0.43x + -0.018x2 + 21.7 + -0.43x + 0.018x2

Reorder the terms:
21.7 + -0.43x + 0.018x2 = -21.7 + 21.7 + 0.43x + -0.43x + -0.018x2 + 0.018x2

Combine like terms: -21.7 + 21.7 = 0.0
21.7 + -0.43x + 0.018x2 = 0.0 + 0.43x + -0.43x + -0.018x2 + 0.018x2
21.7 + -0.43x + 0.018x2 = 0.43x + -0.43x + -0.018x2 + 0.018x2

Combine like terms: 0.43x + -0.43x = 0.00
21.7 + -0.43x + 0.018x2 = 0.00 + -0.018x2 + 0.018x2
21.7 + -0.43x + 0.018x2 = -0.018x2 + 0.018x2

Combine like terms: -0.018x2 + 0.018x2 = 0.000
21.7 + -0.43x + 0.018x2 = 0.000

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

Divide each side by '0.018'.
1205.555556 + -23.88888889x + x2 = 0

Move the constant term to the right:

Add '-1205.555556' to each side of the equation.
1205.555556 + -23.88888889x + -1205.555556 + x2 = 0 + -1205.555556

Reorder the terms:
1205.555556 + -1205.555556 + -23.88888889x + x2 = 0 + -1205.555556

Combine like terms: 1205.555556 + -1205.555556 = 0.000000
0.000000 + -23.88888889x + x2 = 0 + -1205.555556
-23.88888889x + x2 = 0 + -1205.555556

Combine like terms: 0 + -1205.555556 = -1205.555556
-23.88888889x + x2 = -1205.555556

The x term is -23.88888889x.  Take half its coefficient (-11.94444445).
Square it (142.6697532) and add it to both sides.

Add '142.6697532' to each side of the equation.
-23.88888889x + 142.6697532 + x2 = -1205.555556 + 142.6697532

Reorder the terms:
142.6697532 + -23.88888889x + x2 = -1205.555556 + 142.6697532

Combine like terms: -1205.555556 + 142.6697532 = -1062.8858028
142.6697532 + -23.88888889x + x2 = -1062.8858028

Factor a perfect square on the left side:
(x + -11.94444445)(x + -11.94444445) = -1062.8858028

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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