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# C": Differentiation QUESTION (MATHS HELP) watch

1. I don't understand what to do..

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2. lol, that feel when forgetting to release shift
3. (Original post by creativebuzz)
I don't understand what to do..

2x + y + 1 = 0

is the same as

y = -2x - 1 which means the gradient of that line is -2 and you want tangents parallel to that..
4. (Original post by crayolaguy)
lol, that feel when forgetting to release shift
5. (Original post by creativebuzz)
on your title you wrote C" instead of C2, unless C" is a maths module I don't know about.
6. (Original post by crayolaguy)
2x + y + 1 = 0

is the same as

y = -2x - 1 which means the gradient of that line is -2 and you want tangents parallel to that..
Oh yeah, I understood that but I didn't know how to find the x coordinates because, for example, if I set x = 0 in question (a) then I'm left with x = 0, which I wasn't sure was true..
7. (Original post by crayolaguy)
on your title you wrote C" instead of C2, unless C" is a maths module I don't know about.
Oh ahah, no I meant C2
8. (Original post by creativebuzz)
Oh yeah, I understood that but I didn't know how to find the x coordinates because, for example, if I set x = 0 in question (a) then I'm left with x = 0, which I wasn't sure was true..
Just differentiate and then make that equal to -2.
9. (Original post by crayolaguy)
Just differentiate and then make that equal to -2.
Omg of course! How did that not hit me! :P Thank you very much!
10. (Original post by creativebuzz)
Omg of course! How did that not hit me! :P Thank you very much!
Haha it's alright. Theres not that much stuff they can throw at you with this tangents and normals stuff so after you've done lots of questions the steps become clear.
11. (Original post by crayolaguy)
Haha it's alright. Theres not that much stuff they can throw at you with this tangents and normals stuff so after you've done lots of questions the steps become clear.
That's a very good point! (Positive rating given for thanks)

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