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.
How Long Does Bronchitis Last? People with acute bronchitis usually begin to feel better within a few days, although they usually can expect to have a cough for 1 to 2 weeks or longer while the airways in the lungs heal. Chronic bronchitis symptoms last longer and may never resolve, because the damage to the lungs may be permanent. Because excess mucus is being produced, the body's natural reflex will be to cough it up, and this cough may come and go for a long time, flaring up, subsiding, and flaring up again. Occasionally, pneumonia may develop in people with acute bronchitis.