Special Products
Example 102
$\;\;\;(9x^{8} + 4y^{9})(9x^{8} - 4y^{9})$
$=(A + B)( A - B) \text{ , where } A = 9x^{8} \text{ and } B = 4y^{9} $
$=A^2-B^2$
$=(9x^{8})^2 - (4y^{9})^2 $
$=81x^{16} - 16y^{18} $
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