SOLUTION: please help me solve and explain this equation 2x^2+3xy-4y^2 when x=2 and y=4

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Question 469427: please help me solve and explain this equation 2x^2+3xy-4y^2 when x=2 and y=4
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
2x%5E2%2B3xy-4y%5E2
Put x=2 and y=4
2%2A2%5E2%2B3%2A2%2A4-4%2A4%5E2=2%2A4%2B24-4%2A16=8%2B24-64=-32