Find the first and second derivatives of M with respect to X

Question

 M = 9X4 - 12 X 9 + 25 X Y Z + 50

Answer 1

OK I have to make an assumption here that you wrote this correctly.

M = 9*4*X - 12 * 9 *X + 25 * X * Y * Z + 50 I rearrange but that is how you wrote it.

Now you want dM/dX and the SOC too. Coolness can do.

First this is straight forward just do it: simplify first

M = 36X - 108X + 25 XYZ + 50 = -72X + 25XYZ + 50

SO

dM/dX = -72 + 25 YZ

d²M/dX² = 0

I have a feeling you wrote this incorrect but as written that is what you do.