a-1/a = a-1·a-1 = a-2 = 1/a2 = 7, so a2 = 1/7 and a4 = (1/7)2 = 1/49
(a4+1)/a4 = a4/a4 + 1/a4 = 1 + (1/(1/49)) = 1 + 49 = 50
1 Expert Answer
Still looking for help? Get the right answer, fast.
Ask a question for free
Get a free answer to a quick problem.
Most questions answered within 4 hours.
OR
Find an Online Tutor Now
Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.
