Question

give a sample form
$3 \sqrt{7} + \sqrt{63} - \sqrt{7}$
plz I want very very fast...Don,t give rubbish answers to get the points​

Answer 1

Answer:

3√7+√63-√7

=3√7+√(3×3×7)-√7

=3√7+3√7-√7

=6√7-√7

=5√7