Elijah Seow's answer to LYY's Secondary 4 A Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Elijah Seow
Elijah Seow's answer
22 answers (Tutor Details)
1st
This is an optimisation problem involving calculus, form the equation describing the total cost of the cables and take the derivative of that, equate to zero.