Multiply, and Then Simplify If Possible $( 7 \sqrt { x } + 3 ) ( \sqrt { 7 x } - 3 )$

question 364

Multiple Choice

Multiply, and then simplify if possible. Assume all variables represent positive real numbers.
- $( 7 \sqrt { x } + 3 ) ( \sqrt { 7 x } - 3 )$

• A) \(7 x \sqrt { 7 } - 42 \sqrt { x } - 9\)
• B) \(7 x \sqrt { 7 } - 21 \sqrt { x } + 3 \sqrt { 7 x } - 9\)
• C) \(7 x - 9\)
• D) \(7 x - 42 \sqrt { x } - 9\)

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