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# Tricky C3 Differentiation Maths Question Help Please! watch

1. I completed question a with no problems, b is what i'm stuck on.

Since there will be y's and x'es in my equation, how can i solve it?

i tried doing dx/dy and then flipping my answer over, but this made me get the wrong answer.

Help or hints would be appreciated. thank you.
2. (Original post by ZiggyStardust_)

I completed question a with no problems, b is what i'm stuck on.

Since there will be y's and x'es in my equation, how can i solve it?

i tried doing dx/dy and then flipping my answer over, but this made me get the wrong answer.

Help or hints would be appreciated. thank you.
try subbing in your value for dy/dx and y=f(x) given in the question
3. (Original post by bruh2132)
try subbing in your value for dy/dx and y=f(x) given in the question
ye, i tried that just now but ended up with a quartic equation, when i should only be getting a quadratic.

i must be going wrong somewhere?

i subbed 5y as 5x(4x+1)^1/2
4. (Original post by bruh2132)
try subbing in your value for dy/dx and y=f(x) given in the question
LOL NVM. turns out i made a dumb mistake in my workings, i know how to get to the right answer. thanks for you quick response tho )

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