Question

Its asking to expand and simplify an expression for the area of this rectangle. ​

Answer 1

(4x-5)(x+4)

• 4x squared- 16x -5x - 20
• 4x squared-21x - 20

Answer 2

4x^2 + 11x - 20

Explanation:

1. area is width X height
2. multiply the width (4x - 5) and the height(X + 4)
3. I always imagine a multiplication grid for this kind of problem, with X and +4 at the top and 4x and -5 going down, and then combine terms
4. you get 4x^2 + 11x - 20