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# Maths differentiation question help watch

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2. d/dx (gfgb) = (g'f+f'g)(gb)+(g'b+b'g)(gf)
3. (Original post by tavtavtav)
d/dx (gfgb) = (g'f+f'g)(gb)+(g'b+b'g)(gf)
loool sorry, posted the photo now, bit of a mess up at first.
4. (Original post by Ninjakam119)
loool sorry, posted the photo now, bit of a mess up at first.
Fair enough!

question 11 or 12?
silly me (didn't read the changed text)
5. have you made any start?
6. (Original post by Ninjakam119)
Can you post your working and tell us where you're stuck?
7. (Original post by Ninjakam119)
Right you seem to have logged of so a hint for when you get back on.

The volume of a Triangular Prism is the face Area times the length. You know that the face is an equilateral triangle and you know that it's height is h, using Maths you know about triangles you can work out the other sides/area and get the answer in the question.
8. (Original post by tavtavtav)
Right you seem to have logged of so a hint for when you get back on.

The volume of a Triangular Prism is the face Area times the length. You know that the face is an equilateral triangle and you know that it's height is h, using Maths you know about triangles you can work out the other sides/area and get the answer in the question.
Thank you very much, I have finally worked it out.

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