Area Remaining in a Garden

Consider a rectangular garden that has a length of $12$ meters and a width of $7$ meters. Inside the garden, there is a smaller rectangular flower bed that is $4$ meters long and $3$ meters wide. What is the area of the garden that remains after the flower bed has been placed inside it?

Use the formula for the area of a rectangle, which is given by:

$$ A = l imes w $$