If z =2x*2+3y*2 then the value ofdz/dx at x=1 and y=3 is:
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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
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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