Question

the product of number 5 under root 3 and 21 under root 3 is ​

Answer 1

Step-by-step explanation:

You know that for real, positive numbers you have

√

a

⋅

√

b

=

√

a

⋅

b

This means that you can write

√

3

⋅

√

21

=

√

3

⋅

21

If you write

21

as the product of its prime factors

3

and

7

, you can say that

√

3

⋅

21

=

√

3

⋅

3

⋅

7

=

√

9

⋅

7

Now use the same multiplication property of radicals to write

√

9

⋅

7

=

√

9

⋅

√

7

=

3

⋅

√

7

=

3

√

7

Answer link

Answer 2

Answer:

?

Step-by-step explanation:

ans: 22

Why I am not kept step by step because it is very hard to do..