Find 
and 
.f(x, y) = x3 + 7x2y + 5xy3
A. 
= 3x2 + 14xy + 5y3; 
= 7x2 + 15xy2
B. 
= 3x2 + 2xy + 5y3; 
= 7x2 + 3xy2
C. 
= x2 + 7xy + 5y3; 
= 7x2 + 5xy2
D. 
= 3x2; 
= 7x2 + 15xy2
Answer: A
Mathematics
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