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

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Solution

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

Area of rectangle $= l \times b$ sq.units

$= (4 x^{2} - 3 x) \times 5 x y$

$= 4 x^{2} (5 x y) - 3 x (5 x y)$

$= 20 x^{3} y - 15 x^{2} y$ sq.units

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