Find the Sum or Difference $$[ ( 5 x - y ) + 3 z ] [ ( 5 x - y ) - 3 z ]$$

Find the sum or difference.
- $$[ ( 5 x - y ) + 3 z ] [ ( 5 x - y ) - 3 z ]$$

A) $25 x ^ { 2 } + y ^ { 2 } - 9 z ^ { 2 }$
B) $25 x ^ { 2 } - 10 x y + y ^ { 2 } + 30 x z + 6 y z - 9 z ^ { 2 }$
C) $25 x ^ { 2 } + y ^ { 2 } + 30 x z + 6 y z - 9 z ^ { 2 }$
D) $25 x ^ { 2 } - 10 x y + y ^ { 2 } - 9 z ^ { 2 }$

Correct Answer:

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