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# shortcut pls!

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Director
Joined: 23 May 2008
Posts: 739

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11 Feb 2009, 00:58
sqrt((16)(20)+(8)(32))

can this be solved by factoring?

OG 11 says to compute

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Senior Manager
Joined: 02 Nov 2008
Posts: 251

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11 Feb 2009, 01:01
bigtreezl wrote:
sqrt((16)(20)+(8)(32))

can this be solved by factoring?

OG 11 says to compute

It's very easy to compute this and it should take you less than 2 mins.

4 * 20 = 80

8 * 32 = 256 (you can think of this as 16^2)

256 +80 = 336
Director
Joined: 23 May 2008
Posts: 739

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11 Feb 2009, 01:11
thanks..but thats not the right answer...cant illustrate it correctly on here, but you take the sqrt of the whole equation, not just 16
CEO
Joined: 17 Nov 2007
Posts: 3484
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40

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11 Feb 2009, 03:38
1
$$\sqrt{16*20+8*32}=\sqrt{16*20+16*16}=\sqrt{16*(20+16)}=\sqrt{16*36}=4*6=24$$
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VP
Joined: 18 May 2008
Posts: 1176

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11 Feb 2009, 10:20
Yes, I also solved in the same way as walker and got ans as 24. Guys, wht do u think are the questions in OG too simple as compared to those that actually cum in exam?
Director
Joined: 23 May 2008
Posts: 739

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11 Feb 2009, 11:01
walker wrote:
$$\sqrt{16*20+8*32}=\sqrt{16*20+16*16}=\sqrt{16*(20+16)}=\sqrt{16*36}=4*6=24$$

wonderful! thanks

--== Message from GMAT Club Team ==--

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If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Re: shortcut pls! &nbs [#permalink] 11 Feb 2009, 11:01
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