Answer:

Explanation:
The complete question is shown in the attachment.
The length of the rectangle is x + 12. The width of the rectangle is x + 3.
Recall that area of a rectangle is

In terms of x, the area is

Recall the distributive property of real numbers:

We apply this property to get:

We expand again to get:

We now simplify to obtain:

The area of the rectangle is
