What is the following product?

2√42    +   7√2 - 6 - √21

Step-by-step explanation:

Use the FOIL method:  first terms, outer terms, inner terms, last terms:

√[14·12] + √[14·7] - √36 - √21

This simplifies to:  √[3·4·14} + √98 - 6 - √21, or

                                2√42    +   7√2 - 6 - √21

This matches the first answer choice.

if you mean

then it's c. 8, -7/3

but if you mean

then it is

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step-by-step explanation: