Question
If $$Z = {A^3},$$ then $$\frac{{\Delta Z}}{Z} = \_\_\_\_\_$$
A.
$$\frac{{\Delta {A^3}}}{A}$$
B.
$${\left( {\frac{{\Delta A}}{A}} \right)^3}$$
C.
$$3\left( {\frac{{\Delta A}}{A}} \right)$$
D.
$${\left( {\frac{{\Delta A}}{A}} \right)^{\frac{1}{3}}}$$
Answer :
$$3\left( {\frac{{\Delta A}}{A}} \right)$$
Solution :
$${\text{as}}\,z = {A^3},{\text{so}}\,\frac{{\Delta z}}{z} = 3\frac{{\Delta A}}{A}$$