A cone with heighth and radius r has volume V = n²h. If the cone has a height of 6 in. and volume V = 8rzx² + 24rx + 187, what is its radius r in
terms of x?
O A. r= 3x + 2
OB. r= 4x2 + 12x +9
C. r= 2x + 3
OD. r= (2x + 3)(2x - 3)