Question

answer this question and help me please i need your help plz ​

Answer 1

Answer:

iii )21/√3

=21×√3/√3×√3

=21√3/3

=7√3

iv )2√5-15√3/√5

=(2√5-15√3)×√5/√5×√5

=(2√5.√5-15√3.√5)/5

=(2×5-15√15)/5

=(10-15√15)/5

=5(2-3√15)/5

=2-3√15