Find the twice of the cofficient of a2b2 in (4a2 + 9b2)2
Answer & explanation
Correct answer: option 3
(4a2 + 9b2)2 = 16a4 + 81b4 + 2×4a2×9b2
= 16a4 + 81b4 + 72a2b2
Here the coefficient of a2b2 = 72
So, 72×2 = 144
Find the twice of the cofficient of a2b2 in (4a2 + 9b2)2
Correct answer: option 3
(4a2 + 9b2)2 = 16a4 + 81b4 + 2×4a2×9b2
= 16a4 + 81b4 + 72a2b2
Here the coefficient of a2b2 = 72
So, 72×2 = 144