I can't find a solution for this question can anyone help plz..
here is the question:
Thanking you all in advance for helping...A box is constructed out of a 3x4 m2 (metre square) rectangular piece of cardboard by cutting away at each edge a square of side length x and folding up each edge.
(a) Find an expression of the box's volume in terms of x.
(b) What are the possile values of x.
(c) Determine the value of x which maximizes the volume of the box.
Try again 1.17 is a point of inflection. You on the right track but instead of equaling the second derivative to 0 just plug in your critical point from the first derivative into the second derivative. If it gives you a positive answer it a minimum and if produces a negative answer it is a maximum.