Show that for the case of nuclei with odd mass number, A, the Bethe-Weizasacker formula can be

Question:

Show that for the case of nuclei with odd mass number, A, the Bethe-Weizasacker formula can be written as a quadratic in Z-and thus, for any given A, the binding energies of the isotopes having that A take a quadratic form, B = a + bZ + cZ2. Use your result to find the most strongly bound isotope (the most stable one) having A = 117.