evaluate a8 -47a4 +1 Share with your friends Share 0 Abhishek Kr. Jha answered this a8-47a4+1= a42-2a4×472+4722 +1-4722 = a4-4722 +1-22094= a4-4722-22054= a4-4722-220542= a4-472+22052a4-472-22052 {using the identity a2-b2 = a-ba+b} 1 View Full Answer