Where has the 'X' gone??? Watch

mathslover786
Badges: 0
Rep:
?
#1
Report Thread starter 9 years ago
#1
where has the x gone from xln7 to the next step im confused?
Attached files
0
reply
refref
Badges: 0
Rep:
?
#2
Report 9 years ago
#2
Looks like a typo (the derivative cant just be a constant for an exponential graph).

Oh I thought it was saying the derivative was just ln7 ^^ nvm
0
reply
James
Badges: 14
Rep:
?
#3
Report 9 years ago
#3
Differentiate both sides with respect to y, then rearrange.
0
reply
mathslover786
Badges: 0
Rep:
?
#4
Report Thread starter 9 years ago
#4
oh i think i get it .....have they turned x>>>>>>>>>>1 by diffrentiating it?
0
reply
lynseyx
Badges: 0
Rep:
?
#5
Report 9 years ago
#5
The X disapeared as it should. X multiplied by a number differentiated gives you the number without the X, therfore ln7. It wouldn't be just a constant because you'd multiply be y to get dy/dx = yln7, I think?
0
reply
refref
Badges: 0
Rep:
?
#6
Report 9 years ago
#6
(Original post by mathslover786)
oh i think i get it .....have they turned x>>>>>>>>>>1 by diffrentiating it?
Theyve just differentiated both sides. On the left hand side they've used the product rule, on the right just imagine y = cx where c is a constant, the gradient (or derivative) of this is just c because its a straight line. The constant in this case is ln7.
0
reply
mathslover786
Badges: 0
Rep:
?
#7
Report Thread starter 9 years ago
#7
Xln7 same as ln7 X?.....so when you diffrentiate you are left with just the number? have i got that rite?
0
reply
refref
Badges: 0
Rep:
?
#8
Report 9 years ago
#8
(Original post by mathslover786)
Xln7 same as ln7 X?.....so when you diffrentiate you are left with just the number? have i got that rite?
xln7 =/= ln(7x) read my post above
0
reply
rukouine88
Badges: 0
Rep:
?
#9
Report 9 years ago
#9
Hope this helps....
Attached files
0
reply
Tinkerbelle ♥
Badges: 0
Rep:
?
#10
Report 9 years ago
#10
(Original post by mathslover786)
where has the x gone from xln7 to the next step im confused?
it didn't love you back, so it ran off.
0
reply
rukouine88
Badges: 0
Rep:
?
#11
Report 9 years ago
#11
(Original post by Tinkerbelle ♥)
it didn't love you back, so it ran off.
lol
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Cranfield University
    Cranfield Forensic MSc Programme Open Day Postgraduate
    Thu, 25 Apr '19
  • University of the Arts London
    Open day: MA Footwear and MA Fashion Artefact Postgraduate
    Thu, 25 Apr '19
  • Cardiff Metropolitan University
    Undergraduate Open Day - Llandaff Campus Undergraduate
    Sat, 27 Apr '19

Have you registered to vote?

Yes! (441)
37.89%
No - but I will (88)
7.56%
No - I don't want to (80)
6.87%
No - I can't vote (<18, not in UK, etc) (555)
47.68%

Watched Threads

View All