Question 1 Report
Factorize completely 81a4 - 16b4
Answer Details
81a4 - 16b4 = (9a2)2 - (4b2)2 = (9a2 + 4b2)(9a2 - 4b2) N:B 9a2 + 4b2 = (3a - 2b)(3a - 2b)