I get L=4x+4y V=x^2y So x^2y=8000 y=8000/x^2 S0 L=4x+32000/x^2 Then differentiate and put =0
Hey guys, need a hand with a problem.
A cuboid parcel is to be tied with a length of string both across and longways, forming a cross on top of it. The parcel as a length of x, width of x and height of y. The fixed volume is 8000cm cubed.
Find the length, L, of string in terms of x and y.
What is the volume of the box in terms of x and y, and hence find y in terms of x.
Using the previous equation, find the length of string, L, in terms of x only.
What is the minimum length of L?