Write the following sets in roster from:

Perfect squares are:

$0^{2}=0$

$1^{2}=1$

$2^{2}=4$

$3^{2}=9$

$4^{2}=16$

$5^{2}=25$

$6^{2}=36$

$7^{2}=49$

$8^{2}=64>50$

The elements which are perfect square and x < 50 are 0, 1, 2, 3, 4, 5, 6, 7