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: 1637

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: 1963

Ian you are fantastic many thanks

by kaf

Thu Mar 19, 2009 4:08 am
Forum: Data Sufficiency
Topic: OG DS - absolute value questn
Replies: 8
Views: 1570

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: 1805

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: 1570

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: 1035

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: 1173

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: 1963

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: 3244

Hi Lunarpower

if SIDE of a cube is "s", then:
FACE DIAGONAL of a cube = s&#8730;2
MAIN DIAGONAL of the cube = s&#8730;3
Can you please explain what this means

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: 3906

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&#8730;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: 1042

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