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Multiply, and Then Simplify If Possible $\sqrt { 7 } ( \sqrt { 63 } + \sqrt { 21 } )$

Question 27

Multiple Choice

Multiply, and then simplify if possible. Assume all variables represent positive real numbers.
- $\sqrt { 7 } ( \sqrt { 63 } + \sqrt { 21 } )$

A) 42
B) $441 + 7 \sqrt { 3 }$
C) $21 + 7 \sqrt { 3 }$
D) $21 + 49 \sqrt { 3 }$

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