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Aayushi Dayal
Nov 18, 2020, 10:02:31 AM11/18/20
to Discussion forum for Mathematics for Data Science I
in question no. 3, can the square root not take +/- value? how is it (sqrt 3x+15) always non negative?
Anand Iyer
Nov 18, 2020, 10:49:53 PM11/18/20
to Discussion forum for Mathematics for Data Science I, Aayushi Dayal
that's the convention and also a requirement when they appear as functions.
y = f(x) will be a function, y can't have two values for one x-value. Thus, for
y = sqrt(x) to be a function, it's required that we take only positive square-roots of x.
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