Question

If x = 1 and y = -1, find the value of the following:
(d) x + y- 2xy
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Answer 1

Answer:

$given \: \: x = 1 \\ y = - 1 \\ \\x + y - 2xy = 1 +( - 1) - 2(1)( - 1) \\ = 1 - 1 + 2 \\ = 2$