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# Ps- x-4

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Manager
Joined: 05 Jul 2006
Posts: 198
Followers: 1

Kudos [?]: 24 [0], given: 0

Ps- x-4 [#permalink]  08 Sep 2006, 17:14
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
if (x + 1)2 = 900, then x-4 could be equal to which of the following?

27
26
-33
-34
-35
Senior Manager
Joined: 14 Jul 2005
Posts: 402
Followers: 1

Kudos [?]: 12 [0], given: 0

E. -35

(x+1)^2 = 900

i.e. x+1 = 30 or x+1=-30

i.e. x = 29 or x = -31

Hence x-4 = 25 or -35
VP
Joined: 02 Jun 2006
Posts: 1266
Followers: 2

Kudos [?]: 48 [0], given: 0

E. -35

(x+1)^2 = 900

(x+1) = +30

x+1 = 29 or x+1 = -30

x-4 = +25, x-4 = -35
Senior Manager
Joined: 02 Sep 2006
Posts: 256
Followers: 1

Kudos [?]: 26 [0], given: 0

gmatornot wrote:
E. -35

(x+1)^2 = 900

i.e. x+1 = 30 or x+1=-30

i.e. x = 29 or x = -31

Hence x-4 = 25 or -35

I don't understand...how does it become x+1 = 30 or x+1=-30? It appears to me that both sides are squared...but how come there is x+1=-30?
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40 When is |x-4| = 4-x? 29 03 May 2012, 10:38
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