Question

a rectangles length is four feet more than its width write a quadratic function that expresses the rectangles area in terms of its width

Answer 1

Let's call the width: w and the length: L.

L = w + 4
Area = L x w

Substitute w+4 for L in the area equation.

So, Area = (w+4) x w
Rewritten as: w^2 + 4w