2/x +x 3 -2 = 2x -1 +x 3 -2. The first one isn't polynomial as it has a negative exponent and all exponents in a polynomial must be positive. To illustrate why the second one isn't a polynomial rewrite it a little.
The duration of an asthma attack can vary, depending on what caused it and how long the airways have been inflamed. Mild episodes may last only a few minutes; more severe ones can last from hours to days.Mild attacks can resolve spontaneously or may require medication, typically a quick-acting inhaler.More severe attacks can be shortened with appropriate treatment.ild episodes may last only a few minutes; more severe ones can last from hours to days. Mild attacks can resolve spontaneously or may require medication, typically a quick-acting inhaler. More severe attacks can be shortened with appropriate treatment.
Note also the considerable overlap of these diseases. In a patient without allergies and asthma, a cold is typically a mild illness lasting no longer than 2 weeks. But some colds can be severe and last up to 6 weeks. In patients with allergies, nasal symptoms can last considerably longer than 6 weeks after a cold. In patients with asthma, colds can exacerbate the asthma for a long time, and produce much prolonged cough. Finally, untreated nasal allergies are a common cause of uncontrolled asthma. Great question.