Multiply Using One of the Rules for the Square of a Binomial

Multiply using one of the rules for the square of a binomial. Assume any variable exponents represent whole numbers.
- $$( 3 x - 7 y ) ^ { 2 }$$

A) $9 x ^ { 2 } - 42 x y + 49 y ^ { 2 }$
B) $3 x ^ { 2 } + 49 y ^ { 2 }$
C) $3 x ^ { 2 } - 42 x y + 49 y ^ { 2 }$
D) $9 x ^ { 2 } + 49 y ^ { 2 }$

Correct Answer:

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