Respuesta :
Under the assumption your expression is [tex]\frac{3}{4a}[/tex], a cannot equal 0. If a=0, then 4a=0 and we have division by 0, which is undefined.
If your original expression was [tex]\frac{3}{4}a[/tex], a could be any real number.
If your original expression was [tex]\frac{3}{4}a[/tex], a could be any real number.