Let P = 12xy -10y^(2) - 18x^(2) Q = 14x^...

Let `P = 12xy -10y^(2) - 18x^(2)` `Q = 14x^(2) + 12y^(2) + 9xy, and R = 5y^(2) -x^(2) + xy` then (P + Q) - R =

A

`22xy - 3x^(2) + 3y^(2)`

B

`22xy + 3x^(2) - 3y^(2)`

C

`20 xy -7x^(2) - 3y^(2)`

D

`20xy -3x^(2) - 3y^(2)`

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