Question

Let z=X^2y + y^3 + 5x - 3y +2. Find zy

Answer 1

photo

Answer 2

The catch here is to let all x be constants. Treat them as some real, constant number. Can you give it a shot?

Answer 3

@bmp I am not sure where to start to do that

Answer 4

It's a normal derivative. Treat every x as constant, really. Just take the derivative with respect to y. Everything else is a constant. If you feel better, substitute all x for c, and do it like that.

Answer 5

so it would be x^2 + 3y^2 -3 @bmp

Answer 6

Correct :-)

Answer 7

thankyou so much! @bmp

Answer 8

No problem :-)