1√2+3√8+5√32
=√2√2⋅1√2+32√2+54√2
=√22+√2√2⋅32√2+√2√2⋅54√2
=√22+3√24+5√28
=4√2+6√2+5√28
=15√28
.1√2+3√8+5√32
1√2+32√2+54√2
44√2+64√2+54√2
154√2
hmm........ we got different answers
These answers are equivalent, as shown below:
154√2⋅√2√2=15√28
This process is called rationalizing the denominator.