Posted by Jamie on .
Suppose you take a piece of cardboard measuring 7 inches by 7 inches, cut out square corners with sides x inches long, and then fold up the cardboard to make an open box. Express the volume V of the box as a function of x.

Math 
Reiny,
did you make a sketch?
isn't the base after the cutout (72x) by (72x) and isn't the height of the box x inches?
volume of box = base area x height
= 
Math 
Jamie,
Yes so my conclusion is that
V(x) = x (7 – 2x)^2
is this correct? 
Math 
Reiny,
correct

Math 
Jamie,
Thanks! I knew I would get this stuff! Thanks for your help!