Example 34

$\;\;\;(9 + 8k^{7}l^{7})^2$

$=(A + B)^2 \text{, where } A = 9 \text{ and } B = 8k^{7}l^{7} $

$=A^2 + 2AB + B^2$

$=(9)^2 + 2(9)(8k^{7}l^{7}) + (8k^{7}l^{7})^2 $

$=81 + 144k^{7}l^{7} +64k^{14}l^{14} $