The adjacent sides of a rectangle are $(4 x^{2} - 3 y)$ and $5 x y$ . Find its area.

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Solution

Given that,
Length $(l) = 4 x^{2} - 3 y$
Breadth $(b) = 5 x y$

Area of rectangle $= l \times b$
$= (4 x^{2} - 3 y) \times 5 x y$
$= 20 x^{3} y - 15 x y^{2}$

Hence, the area is $20 x^{3} y - 15 x y^{2}$

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