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KEAM 2018 Math Paper
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© examsnet.com
Question : 25
Total: 120
If the sum of the coefficients in the expansions of
(
a
2
x
2
−
2
a
x
+
1
)
51
is zero, then
a
is equal to
0
1
-1
-2
2
Validate
Solution:
(
a
2
x
2
−
2
a
x
+
1
)
51
For sum of coefficients put
x
=
1
(
a
2
−
2
a
+
1
)
51
=
0
⇒
{
(
a
−
1
)
2
}
51
=
0
⇒
a
=
1
© examsnet.com
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