


which simplifies to

and so we take the derivative of that function in terms of l

then we set that to 0

using the quadratic formula


simplifying..



at this point i noticed an error, i used l instead of h... but thats ok
pluggin 0 and 1.6 for h, lets check answers
1.6: h=1.6 l=2.4 w=2
0: h=0 l=0 w=6
so the answer is
h=1.6 l=2.4 w=2, which gives the greatest volume of 7.68