Answer:For a rectangle the expression would be:
A
=
(
x
+
6
)
⋅
(
x
−
3
)
or
A
=
x
2
−
3
x
−
18
Step-by-step explanation:
The formula for area (assuming this is a rectangle) is:
A
=
l
⋅
w
where
A
is the area of the rectangle,
l
is the length of the rectangle and
w
is the width of the rectangle.
In this problem we are provided the length and width which we can substitute for the
l
and
w
is the formula to give:
A
=
(
x
+
6
)
⋅
(
x
−
3
)
We can expand this to the form of a quadratic equation by cross multiplying to give:
A
=
x
2
+
6
x
−
3
x
−
18
A
=
x
2
−
3
x
−
18
Step-by-step Explanation: The formula for area (assuming this is a rectangle) is: A=l⋅w where A is the area of the rectangle, l is the length of the rectangle and w is the width of the rectangle.