Let R be the region in the first quadrant bounded by the graph of y = x² + 4x and the x-axis. A solid is generated when R is revolved around the horizontal line y = -3. What is the definite integral that gives the volume of this solid? (-x²+4x+3)² dx *(-x²+4x-3)² dx (-x+4x+3)-9] (-x+4x-3)2 – 9]ax