3 years ago

Simply the problem.

Mathematics

2 answers:

Marat540 [252]3 years ago

6 0

Answer:

Step-by-step explanation:

$\sqrt{3}\cdot\sqrt{21}= \\\\\sqrt{3\cdot 21}= \\\\\sqrt{63}= \\\\3\sqrt{7}$

Therefore, the correct answer is choice C. Hope this helps!

zlopas [31]3 years ago

4 0

Answer:

3√7

Step-by-step explanation:

√3×√21=√63

√63=√7×√9=√7 × 3

=3√7

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