Answers

2016-05-01T13:00:32+05:30
z =2x*2+3y*2 then the value ofdz/dx at x=1 and y=3is dz/dx = 4x Applying d the value= 4(1) So value is 4 Z= 2(1)*2+3(3)*2 Z=2+27 Z=29
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former one
Z value is 29
okay thanx
so mines correct
Ya absolutely
2016-05-01T13:11:08+05:30
z =2x²+3y² 
putting x = 1 and y = 3,
z = 2 
× 1² + 3 × 3²
   =  2 + 3×9
   = 2+27 = 29

dz/dx  = d × 29 / d × 1 = 29d/d = 29
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