Posted by Subhotosh Khan on October 26, 2002 at 23:54:15:
In Reply to: Re: more help please ok i got alot more stuff posted by Subhotosh Khan on October 26, 2002 at 23:51:01:
: : solve
: : A machine produces open boxes using sqaure sheets of plastic. The machine cuts equal sized squares measuring 3 inches on a side from each corner of the sheet, ,and then shapes the plastic into an open box by turning up the sides. If each box must have a volume of 675 cubic inches, find the length of one side of the open box.
: Since the open box is made from square sheet and cutting off square pieces
: - the bottom of the box must be square.
: Let the side of the bottom = x
: bottom area = x^2
: depthe of box = 3
: Volume of box = 3*x^2
: So:
: 3*x^2 = 675
: x^2 = 225
: x = 15
: : solve
: : 4x^(7/2)-8=0
: 4x^(7/2)-8=0
: 4x^(7/2)=8
: x^(7/2)=2
: x = (2)^(2/7)
: Use a calculator to solve it
: : solve by substitution
: : x^(2/3)+2x^(1/3)-8=0
Use calculator
: : answers a){-4,2} b){-64,8} c){-8,64} d){-2,4}