SOLUTION: how do i solve this problem? 2x squared+3xy-4y squared when x=2 and y=-4

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Question 368458: how do i solve this problem?
2x squared+3xy-4y squared
when x=2 and y=-4
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
+2x%5E2%2B3xy-4y%5E2=2%282%29%5E2%2B3%282%29%28-4%29-4%28-4%29%5E2
Time to get out the calculator.