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X-5=?

Expert replies
Source: — Problem Solving |

by theCEO » Wed Aug 15, 2012 5:29 pm
grandh01 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

OA is C
a^2 = 400
a = 20 or -20
if a =20, x-1= 20 --> x = 21 and x-5 = 16
if a =-20, x-1= -20 ---> x = -19 and x-5 = -24
ans = c
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