Question

X+y=2019 find (-1)^x+(-1)^y

Answer 1

Answer:

We know :

x+y=2019

(-1)^x+(-1)^y  

=(-1)^(x+y)                          // since the bases are the same

(-1)^2019=-1

If the power of -1 is even then the result will be +1 .

If the power of -1 is odd then the result will be -1.

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