Answer:
A(x) = x² + 3x
A(4) = 28 ft²
Step-by-step explanation:
If the length is 3 ft longer than the width, we can represent the length as x + 3
Then, the area of the pool table can be calculated as:
Area = Length x Width
So, replacing the length by x + 3 and the width by x, we get:
A(x) = (x + 3)x
A(x) = x² + 3x
Then, A(4) can be calculated replacing x by 4, so:
A(4) = 4² + 3(4)
A(4) = 16 + 12
A(4) = 28 ft²
Therefore, the answers are:
A(x) = x² + 3x
A(4) = 28 ft²