Question

state with reason that 5√8 and 2√6 are surds or not

Answer 1

these are surds because
$5 \sqrt8 = \sqrt{5 \times 5 \times 8 = \sqrt{200} }$
=sqrt 200 and
$2 \sqrt{6}$
=sqrt2×2×6
=sqrt24
nmbrs like squareroot 200 and squareroot 24 are called surds