Questions
The value of x, for which the 6th term in the expansion of is 84,is equal to
a
4
b
3
c
2
d
5
detailed solution
Correct option is C
We have, 2log29x−1+7+1215log23x−1+17=9x−1+7+13x−1+11/57∴ T6=7C59x−1+77−513x−1+11/55=7C59x−1+713x−1+1⇒ 84=7C59x−1+73x−1+1⇒ 9x−1+7=43x−1+1 ⇒ 32x9+7=43x3+1⇒ y2−12y+27=0 ⇒ y2−12y+27=0 (Put y= 3)⇒ (y−3)(y−9)=0⇒ y=3,9⇒3x=3,9⇒x=1,2Talk to our academic expert!
Similar Questions
The coefficient of x4 in the expansion of is
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