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Grade: 11
        
If (1+2x+3x2)10 = ao+ a1x + a2x2+.......+ a20x20 ,. then aequals :
17 days ago

Answers : (1)

Amarjeet Jayanthi
11 Points
							
(1+2x+3x2)10=[(1+2x+x2)+2x2]10=[(1+x)2+(2x2)]10.
The coefficient of x in (1+2x+3x2)10 is the coefficient of x in [(1+x)2+(2x2)]10
In the expansion [(1+x)2+(2x2)]10 all the terms contain x2 except the first term.
The first term is [(1+x)2]10=(1+x)20 and the coefficient of x is 20.
Answer=20.
17 days ago
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