Answer:
5x^2 - 8x - 32
Step-by-step explanation:
Area of rectangle = base x height
Area of larger rectangle = (3x - 8)(2x + 4)
= 6x^2 - 4x - 32
Area of smaller rectangle = (x + 4)x
= x^2 + 4x
Area of shaded region = area of larger rectangle - area of smaller rectangle
= (6x^2 - 4x - 32) - (x^2 + 4x)
= 5x^2 - 8x - 32
