DS Advance GMAT Quant--

[hershpuri18885]

if a is not equal to 0. 1/a>a/b4(Power4)+3?
1. a2=b2
2. a2=b4

We have to cross multiply... rephrazing it makes the question---
is a positive?? If a is negative then then the sign flips from > to <.

1. a2=b2
The book says that this statement is sufficient...
b2 is positive, so a is positive... (How-- ?)...i think that i am missing something really silly out here..

b4+3= (b2+ root3)(b2-root3)> a2

2. b4=a2-- insuff...
I get this...

[tim]

we need you to give us a more precise source on this problem, because there are problems with the way you typeset it that make it difficult to tell what's going on..

[hershpuri18885]

Dear Tim,

Extremely sorry for the late reply!!

Source--- Advanced GMAT Quant book.
Copyright 2012 MG Prep, Inc.

Data Sufficiency: Strategies and Tactics
Try It #4-9 [Page 106]

This sum explains the flow chart concept...

Regards\\Hersh

[jlucero]

I've attached the problem below, and yes, you did miss something simple here... you misread the statement:

1) a = b^2

NOT a^2 = b^2

Since b^2 must be positive, then a must be positive.