Use One of the Appropriate Patterns $( a + b ) ^ { 2 } = a ^ { 2 } + 2 a b + b ^ { 2 }$

Use one of the appropriate patterns $( a + b ) ^ { 2 } = a ^ { 2 } + 2 a b + b ^ { 2 }$ ; $( a - b ) ^ { 2 } = a ^ { 2 } - 2 a b + b ^ { 2 }$ ; $( a + b ) ( a - b ) = a ^ { 2 } - b ^ { 2 }$ to find the following product. $( 3 x + 3 y ) ^ { 2 }$

A) $9 x ^ { 2 } + 18 x y + 3 y ^ { 2 }$
B) $9 x ^ { 2 } + 9 x y + 9 y ^ { 2 }$
C) $9 x ^ { 2 } + 18 x y + 9 y ^ { 2 }$
D) $9 x ^ { 2 } - 18 x y + 9 y ^ { 2 }$
E) none of these

Correct Answer:

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