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# Totally confused on this ODE. Help! watch

1. I'm totally stuck on part ii of this question.

Q i) Solve ,
when .

Q ii) solve for y again using subsitution , where is a new dependent variable.

This is where I'm totally stuck and I have absolutely no idea how to solve part ii. I know you need to use the chain rule for , however, even here I'm unsure what to do with it.

2. (Original post by BAD AT MATHS)
I'm totally stuck on part ii of this question.

Q i) Solve ,
when .

Q ii) solve for y again using subsitution , where is a new dependent variable.

This is where I'm totally stuck and I have absolutely no idea how to solve part ii. I know you need to use the chain rule for , however, even here I'm unsure what to do with it.

Differentiate to get .

.

Rewrite the D.E in terms of z and t.
3. (Original post by BAD AT MATHS)
I'm totally stuck on part ii of this question.

Q i) Solve ,
when .

Q ii) solve for y again using subsitution , where is a new dependent variable.

This is where I'm totally stuck and I have absolutely no idea how to solve part ii. I know you need to use the chain rule for , however, even here I'm unsure what to do with it.

Then substitute and separate the variables
4. (Original post by brianeverit)

Then substitute and separate the variables
(Original post by BabyMaths)

Differentiate to get .

.

Rewrite the D.E in terms of z and t.
Ok, I see now thanks.

EDIT: babymaths i tried +ve rep'ing you but I got a message saying "Please rate some other members before rating this member again.".
5. (Original post by BAD AT MATHS)
Ok, I see now thanks.

EDIT: babymaths i tried +ve rep'ing you but I got a message saying "Please rate some other members before rating this member again.".
It really is the thought that counts. Thanks.

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