Question

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

Answer 1

The expression for the area is;

`21-12x`

Step-by-step 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* w`

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

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

Therefore, the expression for the area is;

`21-12x`