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# What is the value of P ? 1) 5p - 20 =5 2) (p-10)^2 = p^2

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Intern
Joined: 16 Apr 2005
Posts: 15
What is the value of P ? 1) 5p - 20 =5 2) (p-10)^2 = p^2  [#permalink]

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17 Apr 2005, 10:05
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What is the value of P ?

1) 5p - 20 =5

2) (p-10)^2 = p^2

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

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Senior Manager
Joined: 19 Feb 2005
Posts: 432
Location: Milan Italy

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17 Apr 2005, 10:17
D
from st 1
1 equation 1 solution sufficient
from st 2
p^2-20p+100=p^2
1 equation 1 solution (this is a first degree equation)
Intern
Joined: 16 Apr 2005
Posts: 15

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17 Apr 2005, 10:23

I kept doing the second equation

(p-10)^2 as p^2-100

There was my mistake!

Isnt (p+10)(p-10) = (p-10)^2 ?
Senior Manager
Joined: 19 Feb 2005
Posts: 432
Location: Milan Italy

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17 Apr 2005, 10:30
you can check by yourself that (p+10)(p-10) is not = to (p-10)^2 by substituting p with 2 and seeing that 12*-8 is not 64.

By the way, (a+b)^2=a^2+2a*b+b^2

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This discussion does not meet community quality standards. It has been retired.

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

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Non-Human User
Joined: 09 Sep 2013
Posts: 11398
Re: What is the value of P ? 1) 5p - 20 =5 2) (p-10)^2 = p^2  [#permalink]

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25 Aug 2018, 03:17
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Re: What is the value of P ? 1) 5p - 20 =5 2) (p-10)^2 = p^2   [#permalink] 25 Aug 2018, 03:17
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