1.

If f(x, y, z) = xy + yz + zx, then fx – fz is equal to …(a) z – x (b) y – z (c) x – z (d) y – x

Answer»

(a) z – x 

fx = y + z 

fz = y + x 

fx – fz = y + z – y – x = z – x



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