2x2 + 3xy – 4y2 when x = 2 and y = - 4?

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2x2 + 3xy – 4y2 when x = 2 and y = - 4?

Guest Aug 25, 2015

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Best Answer

+128473

+5

2x^2 + 3xy – 4y^2 when x = 2 and y = - 4 ..... "plugging in," we have ......

2(2)^2 + 3(2)(-4) - 4(-4)^2 =

2*4 + (6)(-4) - 4(16) =

8 - 24 - 64 =

-16 - 64 =

-80

CPhill Aug 25, 2015

1⁺⁰ Answers

+128473

+5

Best Answer

2x^2 + 3xy – 4y^2 when x = 2 and y = - 4 ..... "plugging in," we have ......

2(2)^2 + 3(2)(-4) - 4(-4)^2 =

2*4 + (6)(-4) - 4(16) =

8 - 24 - 64 =

-16 - 64 =

-80

CPhill Aug 25, 2015

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