Question

Question:√3*√21

Answers: √63
√24
None of the above
3√7

Answer 1

=3sqr7

Answer 2

yea Raheen but 63=9*7 right?

Answer 3

3√7

Answer 4

yes, it's simplified as 3√7
but what's wrong with √63

Answer 5

nothing's wrong with it but 3sqr7 is better...my teacher wouldn't give me a single point if i gave the answer sqr63..so i simplify them as much as possible :):) High school trauma :P:P

Answer 6

\[\sqrt{3}\times \sqrt{21}=\sqrt{63}=\sqrt{3^{2}\times7}=3\sqrt{7}\]

Answer 7

angela you are right

Answer 8

:)

Answer 9

"simplest radical form" does not allow
\[\sqrt{63}=\sqrt{3^2\times 7}\] because you can't have a square inside a square root to be in that form. that is why you get no points, even though the numbers are identical