Math (Elementary Algebra)

What is the value of the expression 2x^2 + 3xy - 4y^2 when x = 2 and y = -4 ?
Please help this is for my accuplacer. If you could show your work explaining how you got the answer that would be awesome. Thank you in advance

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  1. 2x^2 + 3xy - 4y^2

    now substitute your values for every x and y:

    2(2^2) + 3(2)(-4) - 4(-4)^2
    = 2(4) - 24 - 4(16)
    = 8-24-64
    = -80

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