GMAT: Data Sufficiency 6
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Problem number 28....
In the first one, what if x =1, then it would prove it to be 1/2 or .5, which is not an integer????
ajone86 1 year ago
prob 28, was wondering if x was odd ?
vanidharatreya 1 year ago
dese r answers for which questions?
shakthiyj 1 year ago
That would be taking the square root of both sides, but in order to do that you will have 2 roots: the positive and the negative. So you'll have to account for each case:
x+1 = x or x+1 = -x
The first case ends up being discarded and the 2nd case is 2x+1 = 0. As Sal explained, it's easy to forget this and get the question wrong, you're better off expanding the squared term and solving that way.
shell3202 1 year ago
Sal: Thanks for these great videos.
For problem 29
(x+1)2=X2
Cant we not remove the "2"square from both side?
X+1=X
1=X-X
1=0
That doesnt give us value of X. How would we know in exam what to choose?
Thanks
sallo808 2 years ago
very useful info thx
ikipi1 2 years ago
u r great mr salman your videos are really helpful for me and just to comment u i made my youtube account
sadscene1 2 years ago
great!
kadsawy 2 years ago