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**1. Homework Statement**

We are given a table where showing the points x and y and values of a function f(x,y).

The function itself is not given.

I have to find the partial derivatives f'x, f'y, f''xx, f''yy and f''xy around the point (2,3).

**2. Homework Equations**

I have to use the definition :

f'x(2,3) = lim (h-->0) [f(2+h,3) - f(2,3)] / h

**3. The Attempt at a Solution**

Ok. So I easily found f'x and f'y. (h is found by looking at the xs and ys, h for f'x = -1 and 2 for f'y).

My problem is finding the f''. My teacher is the kind that shows one definition and gives one example. I don't know how to find the f''s.

If someone could just point the way, I'd be grateful.

Thanks!