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GRE Prep Club Legend  Joined: 07 Jun 2014
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GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
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If (x + 3)2 = 225, which of the following could be the value [#permalink]
Expert's post 00:00

Question Stats: 37% (00:11) correct 62% (01:20) wrong based on 8 sessions
If $$(x + 3)^2 = 225$$, which of the following could be the value of $$x - 1$$?

(A) 13
(B) 12
(C) –12
(D) –16
(E) –19
[Reveal] Spoiler: OA

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Sandy
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Manager  Joined: 06 Jun 2018
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Re: If (x + 3)2 = 225, which of the following could be the value [#permalink]
sandy wrote:
If $$(x + 3)^2 = 225$$, which of the following could be the value of $$x - 1$$?

(A) 13
(B) 12
(C) –12
(D) –16
(E) –19

Given

$$(x + 3)^2$$ = 225

x + 3 = 15 or -15

Note: 15*15 =225 or -15*(-15) =225

So we will have 2 sets of values here.

Case 1 :

x + 3 = 15

x = 12

Case 2 :

x + 3 = -15

x = -18.

Question : the value of x-1.

-18 -1 = -19

Option E fits. Re: If (x + 3)2 = 225, which of the following could be the value   [#permalink] 18 Jul 2018, 12:25
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