1) What is the values of (P+Q)(P−Q) if PQ=7 A) 1/3 B) 2/3 C) 4/3 D) 7/8 Answer: Option CExplanation:Given PQ=7 from that P = 7Q,substitute in P+QP−Q So,we will get 7Q+Q7Q−Q=8Q6Q=43