Q.

Find the solution set of the inequality 2log1/4(x+5)>94log133(9)+log(x+5)(2).

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a

x(-5,-4)(-3,-9)

b

x(-5,-4)(-3,-1)

c

x(-5,-4)(-3,1)

d

None

answer is A.

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Detailed Solution

Given that, 2log1/4(x+5)>94log1/339+logx+52       ……(i)

By Eq. (i), x+5>0x>-5

x+51x-4

So,  x(-5,-4)(-4,)   …(ii)

Now, by Eq. (i)

2-2log2(x+5)-94×-23log39-2logx+52>0

-log2(x+5)-2log2(x+5)+3>0      ……(iii)

Now, let log2(x+5)=y, then Eq. (iii) becomes

-y-2y+3>0   -y2+3y-2y>0   y2-3y+2y<0   (y-2)(y-1)y<0

Question Image

  y<0 or 1<y<2   log2(x+5)<0 or 1<log2(x+5)<2   x+5<1 or 2<x+5<4   x<-4      ......(iv)

or   -3<x<-1        ....(v)

From Eqs. (ii), (iv) and (v),

x(-5,-4)(-3,-1)

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