Lecture 20 (Intermediate Algebra) Quadratic Equation Applications

A rectangle has area 40 and its width is 3 more than its length. Setting the length to x, which equation models the situation?

1. A.x(x + 3) = 40
2. B.2x + 2(x + 3) = 40
3. C.x² + 3 = 40
4. D.x(x − 3) = 40