Special Products
Example 115
$\;\;\;(2 + 5x^{2}y^{3})(2 - 5x^{2}y^{3})$
$=(A + B)( A - B) \text{ , where } A = 2 \text{ and } B = 5x^{2}y^{3} $
$=A^2-B^2$
$=(2)^2 - (5x^{2}y^{3})^2 $
$=4 - 25x^{4}y^{6} $
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