For part C: I got the modulus of X<1/3. But the answer is -1/3<X<1/3. I'm not sure why, can someone explain?!
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Lilly1234567890
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- 16-01-2016 14:17
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- 16-01-2016 15:10
Just from the information in your post, I believe I can see your mistake.
Remember the modulus will always be positive, that does not mean x has to be positive... It could be negative, too. Remember what the modulus actually does.
For example, you know the modulus of -1 = 1.
So... x could be either positive or negative, as |x| = 1/3.
|-1/3| = 1/3
|1/3| = 1/3
And given the nature of the question:
-1/3 < x < 1/3 is your solution(s).
I hope I explained this sufficiently enough -
rayquaza17
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- 16-01-2016 15:18
(Original post by Lilly1234567890)
For part C: I got the modulus of X<1/3. But the answer is -1/3<X<1/3. I'm not sure why, can someone explain?!
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- 16-01-2016 15:39
(Original post by Lilly1234567890)
For part C: I got the modulus of X<1/3. But the answer is -1/3<X<1/3. I'm not sure why, can someone explain?!
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are the exact same thing
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Lilly1234567890
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