mam/sir it is c - a not c-d... reply..
Asked by nikitakoolkarni
| 24th 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
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
| 24th Sep, 2010,
11:07: AM
Kindly Sign up for a personalised experience
- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions
Sign Up
Verify mobile number
Enter the OTP sent to your number
Change