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Function Problem set-Page 79,MGMAT Equations book.

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astharpurohit
 Post subject: Function Problem set-Page 79,MGMAT Equations book.
 Post Posted: Tue Aug 30, 2011 11:10 pm 
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Students


Posts: 10
My Question is regarding the diffrent methods you have solved the 2 vs 4 and 5.

In qs 2
when you took the square root of (d+3)^2 you solved for two possible alternatives one where d=3 was positive and one where d+3 was negative.

In qs 4

when you solve for f(16 you got
3(16)- sq root of 16

here you did not choose two alternatives +4 and - 4,Should you pick both + and - 4 rather than only +4.

You did the same thing in qs 5 instead if taking + and - 2 as answer choice you took only +2

Thanks
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mithunsam
 Post subject: Re: Function Problem set-Page 79,MGMAT Equations book.
 Post Posted: Wed Aug 31, 2011 8:01 pm 
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Course Students


Posts: 76
If a variable is involved, then you need to look for additional cases.

I have explained this problem in the below thread.

http://www.manhattangmat.com/forums/if-g-x-3x-sqrt-x-t13498.html
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jnelson0612
 Post subject: Re: Function Problem set-Page 79,MGMAT Equations book.
 Post Posted: Sat Sep 17, 2011 11:14 pm 
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ManhattanGMAT Staff


Posts: 1857
Also please refer to this link: question-on-function-manhattan-gmat-guide-3-t8655.html

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Jamie Nelson
ManhattanGMAT Instructor
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