Correct Answer: Option B
Sol: (a-1/a)^2 = 3^2 => a^2 -2.a.1/a + 1/a^2 =9 => a^2 + 1/a^2 =11
=>( a^2 + 1/a^2)^2 =(11)^2
=>a^4 +2.a^2.1/a^2 + 1/a^4=121
=>a^4+1/a^4=119
Download our app for free and access thousands of MCQ questions with detailed solutions