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08 Nov 2022, 00:46
Kudos
Bookmarks
Hey, my doubt is:
la-bl = lal - lbl
according to a solution in one of the questions of inequalities: Target test prep
For above expression to be true, a & b must have same sign
but, if we take: a = -10, b =-20
then, la-bl = 10, lal-lbl = -10
hence it does not hold true
please clear my confusion
la-bl = lal - lbl
according to a solution in one of the questions of inequalities: Target test prep
For above expression to be true, a & b must have same sign
but, if we take: a = -10, b =-20
then, la-bl = 10, lal-lbl = -10
hence it does not hold true
please clear my confusion
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08 Nov 2022, 01:06
Kudos
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AbhiSik
You are absolutely correct about your question AbhiSik
la-bl = lal - lbl expression will be true only if
1) a and b both have the same signs (i.e. both positive or both negative) and
2) Absolute value of a is greater than absolute value of b (i.e. when |a| > |b|) because the RHS must be non-negative because LHS is always non-negative)
I hope this help!
So, the person who told you what you mentioned gave you half the story and now you have full. Happy learning!
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