2021
Mathematics
JAMB
Factorize completely 81a4 - 16b4
A.
(3a + 2b)(2a - 3b)(9a2 + 4b2)
B.
(3a - 2b)(2a - 3b)(4a2 - 9b2)
C.
(3a - 2b)(3a + 2b)(9a2 + 4b2)
D.
(6a - 2b)(8a - 3b)(4a3 - 9b2)
Correct Answer: (3a - 2b)(3a + 2b)(9a2 + 4b2)
Explanation
81a4 - 16b4 = (9a2)2 - (4b2)2 = (9a2 + 4b2)(9a2 - 4b2) N:B 9a2 - 4b2 = (3a - 2b)(3a+ 2b)
81a4 - 16b4 = (9a2)2 - (4b2)2 = (9a2 + 4b2)(9a2 - 4b2) N:B 9a2 - 4b2 = (3a - 2b)(3a+ 2b)THIS WEEK's
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