Subject :IMO Class : Class 8
Expansion of (2a + 3b +
4c)2 is ____.
(A) 4a2 + 9b2 + 16c2 + 12ab + 24bc + 16ca
(B) a2 + b2 + 2ca
(C) a2 - b2- 2ca
(D) a2 -
b2 + 2ca
what is this
Ans 1:
Class : Class 6
Use common sense it can't be options b , c and d as (2a)^2 is 4a^2 and except in option a , the answer is not there. So it is A