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# Ps- x-4

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Manager
Joined: 05 Jul 2006
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08 Sep 2006, 18:14
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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
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08 Sep 2006, 22:00
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
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10 Sep 2006, 09:38
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
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11 Sep 2006, 14:41
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?
11 Sep 2006, 14:41
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