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If (x - 1)^2 = 400 which of the following could be the value

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If (x - 1)^2 = 400 which of the following could be the value [#permalink] New post 20 Dec 2012, 09:07
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If (x - 1)^2 = 400, which of the following could be the value of x - 5?

(A) 15
(B) 14
(C) -24
(D) -25
(E) -26
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Re: If (x - 1)^2 = 400 which of the following could be the value [#permalink] New post 20 Dec 2012, 09:09
Walkabout wrote:
If (x - 1)^2 = 400, which of the following could be the value of x - 5?

(A) 15
(B) 14
(C) -24
(D) -25
(E) -26


(x - 1)^2 = 400 --> x-1=20 or x-1=-20 --> x-5=20-4=16 or x-5=-20-4=-24.

Answer: C.
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Re: If (x - 1)^2 = 400 which of the following could be the value   [#permalink] 20 Dec 2012, 09:09
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