CBSE Class 11-science Answered
mam/sir
it is c - a not c-d...
reply..
Asked by nikitakoolkarni | 24 Sep, 2010, 09:56: AM
Expert Answer
Dear student
Logab =4 means a4=b
and logcd =2 means c2=d
given b-d =7 so a4-c2 =b-d=7
so (a-c)(a+c)(a2+c)=7
a and c are positive since log is not defined for negative values
So (a+c) and (a2+c) are positive
since (a-c)(a+c)(a2+c) is positive so a-c >0
So, c-a < 0 so option b is the correct answer
Answered by | 24 Sep, 2010, 11:07: AM
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