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

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What is the value of P ? 1) 5p - 20 =5 2) (p-10)^2 = p^2 [#permalink] New post 17 Apr 2005, 09:05
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What is the value of P ?

1) 5p - 20 =5

2) (p-10)^2 = p^2
Senior Manager
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 [#permalink] New post 17 Apr 2005, 09:17
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)
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 [#permalink] New post 17 Apr 2005, 09:23
That is the right answer!

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 ?
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 [#permalink] New post 17 Apr 2005, 09:30
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
  [#permalink] 17 Apr 2005, 09:30
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What is the value of P ? 1) 5p - 20 =5 2) (p-10)^2 = p^2

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