Question

Find an expression for the area and the perimeter of the rectangle. Let the length = 3 and the width =(7-4x).

Answer 1

Answer:

The expression for the area is;

$21-12x$

Explanation:

Given that the length of the rectangle is 3 and the width is (7-4x);

$\begin{gathered} l=3 \\ w=7-4x \end{gathered}$

Recall that the area of rectangle can be calculated by multiplying its length by the width.

$A=l\times w$

So, the expression for the area of the given rectangle is;

$\begin{gathered} l\times w \\ 3\times(7-4x) \\ 3(7-4x) \\ 21-12x \end{gathered}$

Therefore, the expression for the area is;

$21-12x$