Question

What exclusions are placed on the variable a for the fraction (am^2+4m)/a^2+4

My choices are:
-2
0
none

Answer 1

None.

Explanation:

The only possible restriction in the rational expression
`(am^2+4m)/(a^2+4)` can originate in its denominator being zero for some values of a. However, since the denominator in this case (a^2+4) is always positive (and larger or equal to 4) for all values, no restrictions on the variable a exist.