flygmat wrote:

If x is positive, is x > 3 ?

(1) (x - 1)^2 > 4

(2) (x - 2)^2 > 9

I thought

1) x>0 or x>3

2) x>5 or x>-1 so E, but OA is D. Could anyone explain? Thanks!

(1) (x - 1)^2 > 4

(x - 1)^2 - 2^2>0

(x-1-2) (x-1+2)>0

(x-3)(x+1)>0

x>3 and

x>-1 (X is positive.. so this solution is not feasible)

Sufficient

(2) (x - 2)^2 > 9

(x-5)(x+1)>0

x>5 ---sufficient

and

x>-1 (X is positive.. so this solution is not feasible)

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