Question

Find the product of following using identity
$( \frac{3x}{2} - 1.2y)( \frac{5x}{2} + \frac{3x}{2} )$
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Answer 1

$( \frac{3x}{2} - 1.2y)( \frac{5x}{2} + \frac{3x}{2} ) \\ = \frac{15}{4} {x}^{2} + \frac{9}{4} {x}^{2} - 3xy - 1.8xy \\ = 6 {x}^{2} - 4.8xy</p><p>$