Data Sufficiency

If 6a+b=48, what is the value of b?


1. 4a^2 =50

2.4a=b+2


qa is b. I got D.


My approach: I simplified given information to: b=48-6a, so if I get a, then I can answer the question.

1.4a^2=50 ===> a=sqrt 12.5 sufficient (atleast for me)
2.o obviously suffiicient..

what is wrong with statement 1?

Hey Enginpasa1,
I have seen ur two posts (including this one) I replied. It seems to me that u r sticking to the same problem - When u r having some equ like x^2 = a or x^4 = b or something like this, u can not be confirm about the value of x because the value of x can be both positive or negative.
This theory repeats here as well. Now look by stmt-1, u can not be confirmed about the value of a because value of a can be sqtrt(50/4) or -sqrt(50/4). Hope u r getting what I want to mean!
But now if u go with the stmt-2, using stmt-2 and the equ mentioned in the Qs, u can get the vaue of b. So IMO B.

THank you for watching my flaws. THis is very much appreciated.
Learning from my mistakes and your pointers, even exponents can have a postve or negative base. THus, hiding the base sign! Please correct me if I wrong. If I get that, then it means I cna easily truck through those questions!

camitava

check this thread....
https://www.beatthegmat.com/inequality-q ... t8828.html

it often confuses me what should be right choice with these kind of questions..isnt there a ground rule for GMAT for questions like this.
Why is it soo different when we have x in equation and when x isnt there?

Hemant28,
I have checked the link u sent. But I am not getting what u r asking for! Can u pls elaborate little more ...