Question

FOR AN IDEAL GAS AT CONSTANT TEMPERATURE, THE VARIABLES P (PRESSURE) AND V (VOLUME) ARE RELATED BY THE EQUATION pv^k = C, WHERE K AND C ARE CONSTANTS. IF THE VOLUME IS CHANGED SLIGHTLY FROM V0 TO V0+
Dv (with right direction arrow on top), WHAT QUADRATIC APPROXIMATION EXPRESSING P IN TERMS OF
DV (with right arrow on top) WOULD YOU USE? (
FIND THE APPROXIMATION VALID FOR
DV (with right arrow on top) ≈0.) (Unit 3 2A.11)

I guess I'm confused on how to set up the equation properly.