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Title: An open box is to be made from a rectangular piece of material 9 in. 12 in. by cutting equal square Post by: ccnnieeee on Jan 16, 2019 Please see the attachments
Title: Re: An open box is to be made from a rectangular piece of material 9 in. 12 in. by cutting equal sq Post by: bio_man on Jan 16, 2019 Hi ccnnieeee
Please type out the question (or copy-paste it) next time, would appreciate it a lot! I've answered question (1) underneath. So, they want the volume. V = l*w*h for a rectangular prism L = 12 - 2x W = 9 - 2x H = x Substitute into the formula for volume: f(x) = V = (12 - 2x)(9 - 2x)(x) f(x) = 4x^3 - 42x^2 + 108x Attached for clarity: Also, if you're being asked to maximize, use this video: https://www.youtube.com/watch?v=gEyWoGU-Hn8 |