Question

Is square root of 48 a rational number ? & how ?

Answer 1

No , because
$\sqrt{48}$
can be written as
$\sqrt{16}$
×
$\sqrt{3}$
and it is 4×
$\sqrt{3}$
and root 3 is an irrational number .
or
$\sqrt{48}$
is a non-terminating and non repeating number so it is irrational.
Hope it helps