is M < 0?
(1) -M = |-M|
(2) M square = 9, in other words, M^2 = 9
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absolute value!
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Frankenstein
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Hi,
From(1):
-M = |-M|
-M should be non- negative. So, M is non-positive
i.e. M <= 0
Not sufficient
From(2):
M =-3 or M= +3
Not sufficient
From(1) and (2):
M <= 0 and M = -3 or +3
So, M = -3
M<0
Sufficient
Hence, C
PS: I have deleted my post on the other thread. So, you may delete that thread.
From(1):
-M = |-M|
-M should be non- negative. So, M is non-positive
i.e. M <= 0
Not sufficient
From(2):
M =-3 or M= +3
Not sufficient
From(1) and (2):
M <= 0 and M = -3 or +3
So, M = -3
M<0
Sufficient
Hence, C
PS: I have deleted my post on the other thread. So, you may delete that thread.
Cheers!
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