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what is the value of the expression 2xto the second power + 3xy - 4yto th second power when x = 2 and y = -4

what is the value of the expression 2xto the second power + 3xy - 4yto th second power when x = 2 and y = -4? please help show work, sample test... taking entrance exams for college in 2 days.... ty =]
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