Answer:
5x^3+17x^2−10x−15
Step-by-step explanation:
(5x+3)(x+5)(x-1)=large rectangle
(3x)(2x-1) = small rectangle
(5x+3)(x+5)(x-1) - (3x)(2x-1) = shaded area
=> simplify to 5x^3+17x^2−10x−15
