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December 18, 2014

December 18, 2014

Posted by **John** on Tuesday, April 20, 2010 at 2:24am.

2x^2 - 3xy + 4y^2 for x=2, y=-1

My Answer:

(2(2^2)) - (3*2*-1) + (4(-1^2)) = 10

Text Book Answer: 18

Please help. Am I doing something wrong? I redid the expression 3 times and still got 10. But why textbook say it's 18?

Thank you.

- Gr. 10 Math -
**Dr Russ**, Tuesday, April 20, 2010 at 5:00am2x^2 - 3xy + 4y^2 for x=2, y=-1

My Answer:

(2(2^2)) - (3*2*-1) + (4(-1^2)) = 10

8-(-6)+4(1)=14+4=18

The text book is correct.

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