A) \[\left( 3-21z \right)\left( 1+3z \right)\]
B) \[\left( 1-21z \right)\left( 1+3z \right)\]
C) \[\left( 2+21z \right)\left( 1+3z \right)\]
D) \[\left( 1-7z \right)\left( 1+2z \right)\]
Correct Answer: B
Solution :
(b): Use same process as in Q9.
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