Simply functions

For which of the following, y can be a function of x?

1. x4=y2

2.y=(log x)2

5 Answers

262
Aditya Bhutra ·

1. we get two values of y for a particular x ( y=±x2) hence not a function.
2. we get unique value of y for each x (given x is positive) hence a function

1
Ayush Dube ·

For root of any square say...√x2 is always modulus of x
hence ur first function is mod y = (mod x)2
for x=1,2,3,4....
we get two values of y....
Hence itz nt a function

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1
fahadnasir nasir ·

2

1
Abhinav Gupta ·

Thanks for your time guys....
@Aditya

2nd is not a function too.(As per the answer in the book.)

262
Aditya Bhutra ·

i think they considered domain to be all real nos.
that is why i included that if given that x is positive , then it will be a function.

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