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December 21, 2014

December 21, 2014

Posted by **Mia** on Tuesday, April 29, 2014 at 11:52pm.

f(x, y) = x^2 + xy + y^2 + 2x - y ;

at (-5, 4)

fx(-5, 4) = ?

fy(-5, 4) = ?

- *math (7) -
**Kuai**, Wednesday, April 30, 2014 at 12:23amf(x, y) = x^2 + xy + y^2 + 2x - y ;

at (-5, 4)

fx(-5, 4) = 2x + y +2 = -10+ 4 + 2 = -4

fy(-5, 4) = x + 2y -1 = -5 + 8 -1 = 2

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