Help differentiation
Help I don’t get why they multiplied by 4 in the answers I know it’s the derivative of 4x-1
But for most qs we don’t multiply by this for
Like in this q part a we don’t do that thing
But for most qs we don’t multiply by this for
Like in this q part a we don’t do that thing
(edited 11 months ago)
Original post by Alevelhelp.1
Help I don’t get why they multiplied by 4 in the answers I know it’s the derivative of 4x-1
But for most qs we don’t multiply by this for
But for most qs we don’t multiply by this for
Chain rule applies for differentiating ln(4x-1) and if done properly it will show why the 4 appears.
Original post by RDKGames
Chain rule applies for differentiating ln(4x-1) and if done properly it will show why the 4 appears.
Can u check my edit plz I posted another pic which this rule doesn’t apply to
Original post by Alevelhelp.1
Help I don’t get why they multiplied by 4 in the answers I know it’s the derivative of 4x-1
But for most qs we don’t multiply by this for
Like in this q part a we don’t do that thing
But for most qs we don’t multiply by this for
Like in this q part a we don’t do that thing
If y= Ln(ax+b)
dy/dx = 1/ax+b * a’ (derivative of (ax+b)
y = ln(4x-1)
dy/dx = 1/4x-1 x 4
Differentiate 4x-1 = 4
Original post by Alevelhelp.1
Can u check my edit plz I posted another pic which this rule doesn’t apply to
It does apply. What you show is the simplified form missing the initial step of the chain rule.
Original post by Alevelhelp.1
Help I don’t get why they multiplied by 4 in the answers I know it’s the derivative of 4x-1
But for most qs we don’t multiply by this for
Like in this q part a we don’t do that thing
But for most qs we don’t multiply by this for
Like in this q part a we don’t do that thing
basically what the others have said. for chain rule:
u=4x-1 y=ln u
du/dx=4 dy/du= 1/u
du/dy= 4 x 1/u = 4/4x-1
hope that helps
Original post by nnnn6666
basically what the others have said. for chain rule:
u=4x-1 y=ln u
du/dx=4 dy/du= 1/u
du/dy= 4 x 1/u = 4/4x-1
hope that helps
u=4x-1 y=ln u
du/dx=4 dy/du= 1/u
du/dy= 4 x 1/u = 4/4x-1
hope that helps
Original post by Alevelhelp.1
But I got this I don’t get where the other 4 comes from
What "other 4"? There is no "other 4" - they've used as part of the chain rule, which is precisely what you've shown in your working!
Original post by davros
What "other 4"? There is no "other 4" - they've used as part of the chain rule, which is precisely what you've shown in your working!
Ohhh exam pressure is getting to me and I’ve got the worst cold ever 😭😭😭
I literally feel dizzy idk what to do my exam is on Monday
Original post by Alevelhelp.1
Ohhh exam pressure is getting to me and I’ve got the worst cold ever 😭😭😭
I literally feel dizzy idk what to do my exam is on Monday
I literally feel dizzy idk what to do my exam is on Monday
Take a break for a bit! Or alternate your revision with some exercise or something
Original post by davros
Take a break for a bit! Or alternate your revision with some exercise or something
I can’t risk breaks 😭 there’s too much work to do and I don’t know much
I take dinner breaks and stuff tho (1hour long)
(edited 11 months ago)
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