If x $ y = x – y + xy, then find the value of 9 $ -4.

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-23

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-31

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Solution

The correct option is C -23
If x $ y = x – y + xy, then
9 $ -4 = 9 – (-4) + 9 x (-4)
= 9 + 4 – 36
= 13 – 36
= - 23

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