Question

What is the product of 6the square root of 7. • 2the square root of 21.? Simplify if possible.

Choices:

8the square root of 21.
12the square root of 3.
12the square root of 21.
84the square root of 3.

Answer 1

from your options you want
\[6\sqrt{7}*2\sqrt{3}=12\sqrt{7*3}=?\]

Answer 2

@undeadknight26 could you help me?

Answer 3

you can multiply any two real numbers under the radical sign ,provided both are not negative.
\[12 \sqrt{7*3}=12 \sqrt{21}\]