WilDThiNg wrote:

Yes, please can u elaborate why |f(5−x)|=|5−x−5| and not I5 - (x-5)I - is there any fundamental concept i am missing.

Thanks

This is how functions work:

If we know that f(x) = x - 5,

f(a) = a - 5

f(2x) = 2x - 5

f(x+2) = (x + 2) - 5

f(g(x)) = g(x) - 5

Now, if we know that g(x) = 5 - x, then

f(g(x)) = 5 - x - 5

Does this help?

For more on functions, check:

https://www.veritasprep.com/blog/2015/0 ... s-on-gmat/
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Karishma

Veritas Prep GMAT Instructor

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