DS on squares

[knight247]

Is x>0?
(1)x²>36
(2)x^4>16

Don't have an OA.
(1)Assume x²=64 Hence x=±8 INSUFFICIENT
(2)Assume x^4=81 x=±3 INSUFFICIENT

Combining both we still can't get a resolution. Hence E. Is my logic correct?

[vinod192]

1. Insufficient as X having 2 values +6/-6
2. Sufficient as X>2 since 2>0 hence X>0

Answer is B.

[HeintzC2]

x = -2 also yields a result of 16 (-2*-2*-2*-2). Therefore, x >2 or x<-2 from statement 2.
combining these statements yields no useful new data (statement 1 told us x>6 or x<-6).

IMO E

1. Insufficient as X having 2 values +6/-6
2. Sufficient as X>2 since 2>0 hence X>0

Answer is B.

[BlindVision]

Is x>0?
(1)x²>36
(2)x^4>16

Don't have an OA.
(1)Assume x²=64 Hence x=±8 INSUFFICIENT
(2)Assume x^4=81 x=±3 INSUFFICIENT

Combining both we still can't get a resolution. Hence E. Is my logic correct?

E

[GmatKiss]

IMO: E
(1)x²>36
x < -6 and x > 6
(2)x^4>16
x > -2 and x < 2

1+2, still not certain on the x! Hence E

[navami]

Clearly E.

hence according to Option 1. x <-6 or x >6
according to option 2. x<-2 or x >2

even if we combine 1 AND 2
x could be -7 or 7

hence E