Question 183960
What is the value of the expression 2x squared + 3xy - 4y squared when x=2 and y=-4?
A. -80
B. 80
C. -32
D. 32 
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2x^2 + 3xy - 4y^2
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2(2)^2 + 3*2*4 - 4*4^2

= 8 + 24 - 64

= -32
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Cheers,
Stan H.