SOLUTION: what is the value of the expression of 2x squared plus 3xy minus -4y2 when x = 2 and y =4 ? how can i solve this can you break it down for me

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Question 924719: what is the value of the expression of 2x squared plus 3xy minus -4y2 when x = 2 and y =4 ? how can i solve this can you break it down for me
Answer by srinivas.g(540) About Me  (Show Source):
You can put this solution on YOUR website!
give expression : +2x%5E2%2B3xy-4y%5E2
put x=2 & y=4 in above expression
2x%5E2%2B3xy-4y%5E2 = +2%2A%282%29%5E2%2B3%2A2%2A4-4%2A4%5E2
=+2%2A4%2B24-4%2A16
=8%2B24-64
=32-64
= -32
result is -32