Suppose 2016√2015√...√3√√x=x2−y,
for x,y∈Z,
for x≥0
Find the number of possible values for x+y.
Theoretically, it could be any positive number as X and Y are undefined and no negative can be under a square root.
BOOOOOOOOOOOM!!!!!
Another way to write this is
x=(x2−y)2016!
x and y must both be integers
If x=0 and y=0 then 0=0 that works
If x=1andx2−y=±1
that would work to if they are both integers that is
1-y=1
y=0
so
if x=1 and y=0 that works too
1-y=-1
2=y
so
if x=1 and y=2 that will work
and that is it
so the 3 answers are (0,0) (1,0) and (1,2)
So x+y = 0 or 1 or 3
Maybe another mathematician can do it a different / better way ??