# What is the area of a rectangle in terms of x if the length is (2x + 3) and the width is 3x?

$6 {x}^{2} + 9 x$
Area of triangle = $l \times b$
= $\left(2 x + 3\right) \times 3 x$
= $6 {x}^{2} + 9 x$