Example 94

$\;\;\;(3a^{8} + 10b^{4})(3a^{8} - 10b^{4})$

$=(A + B)( A - B) \text{ , where } A = 3a^{8} \text{ and } B = 10b^{4} $

$=A^2-B^2$

$=(3a^{8})^2 - (10b^{4})^2 $

$=9a^{16} - 100b^{8} $