Modelling with differentiation (Edexcel IAL P2 7.4)

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Pearson Edexcel IAL Pure Mathematics 2 Unit 7.4 Modelling with differentiation
Unit 7 Differentiation
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I'm self studying p2 and these videos are godsend thank you so much

javedfaizal
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Hello sir! Thank you so much for your videos, again!
I have a question, 14:11 when the equation is differentiated how does it become -3x ?
+ 14:37, how is the final answer l=x for when v is a max? how did we figure out that it is a negative?
I know i have asked way too many questions, I apologise! 14:57 as the surface area/area is being calculated, how was it figured out that the height was 3, since the base perimeter was (xl)

nh
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Sir, at 14:34 when multiplying k/6 by surd 6/k the answer I got is surd (6k)/6 not surd k/6.Could you explain silly me how to get this answer?

sahaninethsara
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Sir, your vids are godsend. In 8:06 how would I know I should ignore the negative vague of x (-5 root 2) ?

APW-zsom