Question

1. Simplify the following:
(i) √45 - 3√20 + 4√5​

Answer 1

√ 9×5 - 3 √4×5 + 4√5

3√5 - 6√5 + 4√5

(3-6+4)√5

(-3+4) √5

√5

Answer 2

Answer:

= √45 - 3√20 + 4√5

=  3√5 -3*2√5 +4√5  

= 3√5-6√5+4√5

=  (3-6+4)√5  

= (-3+4)√5

Answer= √5

(Some are common so that's why it has been removed )

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