Search found 53 matches
Inequalities
Hi, Can someone please help in explaining this to me.
I saw this question in OG
1-x^2 >= 0
in the answer explanation 1-x^2 was factored to get
(1-x)(1+x)
My question is how do you factor 1-x^2 to get (1-x)(1+x)?
I would be very grateful if someone could explain this to me please.
thanks
- by kaf
Tue Mar 24, 2009 12:12 am- Forum: Problem Solving
- Topic: Inequalities
- Replies: 5
- Views: 1263
Great Maths Review
Hello All Does any one have a copy of Great Maths Review Twinsplitter(guy who scored 790 and has a debrief on test magic) mentioned. test Magic will not allow downloads from newbies and the URL provided does not work. Anyone who has it should please forward a copy to me at vicadade@yahoo.com thanks
- by kaf
Thu Mar 19, 2009 10:33 am- Forum: GMAT Strategy
- Topic: Great Maths Review
- Replies: 1
- Views: 1638
Thanks a lot Ian I saw this this DS question and i have been trying to figure it out.If you can please help with a little explanation i will be grateful Are lines p (with slope m) and q (with slope n) perpendicular to each other? 1. m + 2 = n 2. m + n = 0 I don't know the answer to this question. I ...
- by kaf
Thu Mar 19, 2009 8:20 am- Forum: Problem Solving
- Topic: explanation please
- Replies: 9
- Views: 1964
- by kaf
Thu Mar 19, 2009 4:08 am- Forum: Data Sufficiency
- Topic: OG DS - absolute value questn
- Replies: 8
- Views: 1571
DanaJ wrote:You actually solved this one correctly: two lines are perpendicular if the product of their slopes is -1. As you've pointed out, only by using both stmts can you reach that conclusion.
Could you please explain how the products of their slopes is -1
thanks
- by kaf
Thu Mar 19, 2009 4:06 am- Forum: Data Sufficiency
- Topic: Slope
- Replies: 7
- Views: 1806
Re: OG DS - absolute value questn
If x and y are integers and y = |x+3|+|4-x| , does y equal 7 ? 1) x < 4 2) x > -3 Also , please explain a little how to solve these types of questions I am not able to do well in absolute value questions :/ To answer the more difficult absolute value questions on the GMAT, it can be very useful to ...
- by kaf
Thu Mar 19, 2009 3:09 am- Forum: Data Sufficiency
- Topic: OG DS - absolute value questn
- Replies: 8
- Views: 1571
Princeton review CAT1 DS
Can someone please explain to me why the answer to this DS problem is D although i think is E If tower A is less than 100 feet tall, is tower B taller than tower A? (1)Tower B is 3 times as tall as tower A. (2)Tower A is 30 feet shorter than tower B. Because Steam of the question implies that the he...
- by kaf
Thu Mar 19, 2009 2:25 am- Forum: Data Sufficiency
- Topic: Princeton review CAT1 DS
- Replies: 2
- Views: 1036
Princeton review CAT1
Can somebody please explain why the answer to this question is A thanks A train traveling at a constant speed down a straight track crosses a certain line on the track. If the rear wheels of the train cross the line 2 seconds after the front wheels, and the centers of the rear and front wheels are 1...
- by kaf
Thu Mar 19, 2009 1:46 am- Forum: Problem Solving
- Topic: Princeton review CAT1
- Replies: 1
- Views: 894
cramya could you please explain definition of modulus and generally the whole process sqrt( -x |x|) Definition of modulus |x| = x if x>=0 |x| = -x if x<0 In the given problem x is negative Applying the defnition here |x| = -x sqrt(-x * -x) = sqrt(x^2) = +ve x So this +ve x is - (original x which is ...
- by kaf
Thu Mar 19, 2009 12:55 am- Forum: Problem Solving
- Topic: GMAT-Prep Q
- Replies: 3
- Views: 1174
explanation please
Can some please explain to me why
sq root(x) = x-2
solving we get x=4 and x=1
thanks
- by kaf
Thu Mar 19, 2009 12:11 am- Forum: Problem Solving
- Topic: explanation please
- Replies: 9
- Views: 1964
DS princeton CAT 1 help
Can some please explain to me why the answer to this DS question is E
Is the integer q a perfect square?
(1) q is even.
(2) 13 < q < 17
thanks
- by kaf
Wed Mar 18, 2009 10:34 am- Forum: Data Sufficiency
- Topic: DS princeton CAT 1 help
- Replies: 1
- Views: 3247
Hi Lunarpower
Can you please explain what this meansif SIDE of a cube is "s", then:
FACE DIAGONAL of a cube = s√2
MAIN DIAGONAL of the cube = s√3
thanks
- by kaf
Mon Mar 16, 2009 2:57 pm- Forum: Problem Solving
- Topic: Help with one more GMAT problem solving question
- Replies: 9
- Views: 3907
is 2^x greater than 100
Can some one please explain why the answer to this DS question is D
Is 2^x greater than 100?
ST1 2√x = 8
ST2 2^-x < 0.01
thanks
- by kaf
Mon Mar 16, 2009 1:23 pm- Forum: Data Sufficiency
- Topic: is 2^x greater than 100
- Replies: 1
- Views: 2207
need explanation with this please
Hi
Can someone please explain to me why if
x(x+2)=0
x = 0 or x = -2
thanks
- by kaf
Thu Mar 12, 2009 12:21 pm- Forum: Data Sufficiency
- Topic: need explanation with this please
- Replies: 1
- Views: 1043
Exponents
Can someone please explain this for me
5^21 * 2^22 = 2 * (5^21 * 2^21)
and if you can kindly point me to a good tutorial for exponents
thanks
- by kaf
Wed Mar 11, 2009 4:36 am- Forum: Problem Solving
- Topic: Exponents
- Replies: 2
- Views: 1149