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21 March, 19:00

What is the value of the expression 2x2 3xy - 4y2when x = 2 and y = - 4? a. - 80 b. - 32 c. 32 d. 80

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  1. 21 March, 19:13
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    2x^2 + 3xy - 4y^2 when x = 2 and y = - 4

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