# Differentiation IIWatch

#1
How to solve Exercise 8H Question 18? See attached workings. I could not arrive to a solution.
0
4 weeks ago
#2
(Original post by JudaicImposter)
How to solve Exercise 8H Question 18? See attached workings. I could not arrive to a solution.
Towards the end. Not sure where you got this from (red bit below)

It should be

Hence

Now you want this to have a single solution.

Last edited by RDKGames; 4 weeks ago
1
#3
(Original post by RDKGames)
Towards the end. Not sure where you got this from (red bit below)

It should be

Hence

Now you want this to have a single solution.

How to find what value of k gives the equation a single solution when you don't know what x is? If there is one solution the quadratic terms of x would be eliminated.
0
4 weeks ago
#4
(Original post by JudaicImposter)
How to find what value of k gives the equation a single solution when you don't know what x is? If there is one solution the quadratic terms of x would be eliminated.
It's a quadratic in ... if we impose a condition that it has a single solution, then have a think what that says about the discriminant.
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