Solve the equation for V.
3v^2+19v+30=0

maximum area = xy = (16)(32) = 512 ft2

to maximize the area of the garden, the side of the fence parallel to the side of the house should be 32 ft long, and the other two sides should both have length 16 ft.'

source

my guess would be b and d, but i didn’t actually get out the pen and paper. lol