1) If log2(a2−1)−log2(a+1)=3, find the value of a. A) 9 B) 8 C) 7 D) 6 Answer: Option AExplanation:log2(a2−1)−log2a+1 =log2(a2−1)a+1 =log2(a+1)(a−1)a+1 =log2a−1 Given, log2a−1=3 ie 23=a−1 8 = a-1 a = 9