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# find the range of y=[x]+[-x]  where[] denotes G.I.F.

Ashwin Muralidharan IIT Madras
290 Points
9 years ago

Hi Manmohan,

To find out the range, you need to find the entire interval in which 'y' lies for all values of 'x' in the domain.

Here clearly domain is the entire set of real numbersd.

Here we will consider two cases..... (1) x is an integer, and (2) x is a non-integer.

(1) when x is an integer [x] = x and [-x] = -x, so sum is 0..... ie y = 0 when x is integer.

(2) when x is non-integer: consider that x is positive, in that case [-x] = -[x] - 1.... so sum = -1..... ie y = -1 when x is a positive non integer.

similarly, when x is a negative non-integer.... [x] = -[-x]-1..... so again y = -1.

So 'y' can take only two values : 0, -1..... Hence the range is the set of two numbers viz. {-1,0}.

Hope that helps!!!!

Regards,