Intergration help Watch

EpicTree
Badges: 2
Rep:
?
#1
Report Thread starter 4 years ago
#1
So here's the picture of the question and my working out, I tried integrating it and cleaning it up, then put it into y = mx + c and got a ridiculous answer.. can anyones see where i went wrong or if im doing it completely wrong

side ways im sorry
Attached files
0
reply
civeng1597
Badges: 0
Rep:
?
#2
Report 4 years ago
#2
To find the gradient you're supposed to differentiate, not integrate. Get dy/dx then put in the x value to get the gradient
0
reply
Mutleybm1996
Badges: 18
Rep:
?
#3
Report 4 years ago
#3
(Original post by civeng1597)
To find the gradient you're supposed to differentiate, not integrate. Get dy/dx then put in the x value to get the gradient
S/he was given the gradient


Posted from TSR Mobile
0
reply
philgreek
Badges: 4
Rep:
?
#4
Report 4 years ago
#4
(Original post by EpicTree)
{working}
It all looks good to me except when you calculate c you put 3*9^2 when you actually want 3*9^3.

So you're finally answer for c would be -2334

and your equation y = 3x^3 + 6x^1.5 - 2334
0
reply
EpicTree
Badges: 2
Rep:
?
#5
Report Thread starter 4 years ago
#5
(Original post by philgreek)
It all looks good to me except when you calculate c you put 3*9^2 when you actually want 3*9^3.

So you're finally answer for c would be -2334

and your equation y = 3x^3 + 6x^1.5 - 2334

oh yea I recalculated it and I got the same, I accidently squared the first one rather than cubing it. But this is all noncalculator so the multiplication is pretty difficult
0
reply
philgreek
Badges: 4
Rep:
?
#6
Report 4 years ago
#6
(Original post by EpicTree)
oh yea I recalculated it and I got the same, I accidently squared the first one rather than cubing it. But this is all noncalculator so the multiplication is pretty difficult
Are you certain it is non-calculator then, as I agree that it isn't the sort of numbers you would expect to deal with in a non-calc questions. Either way the answer definitely works fine so that's something.
0
reply
Mr M
  • Forum Helper
Badges: 20
Rep:
?
#7
Report 4 years ago
#7
(Original post by EpicTree)
...
Here we go again. Third time today.

http://www.thestudentroom.co.uk/show...php?p=51265473
0
reply
BBeyond
Badges: 5
#8
Report 4 years ago
#8
(Original post by Mr M)
Here we go again. Third time today.

http://www.thestudentroom.co.uk/show...php?p=51265473
Must be as the thread isn't stickied
1
reply
Mr M
  • Forum Helper
Badges: 20
Rep:
?
#9
Report 4 years ago
#9
(Original post by BBeyond)
Must be as the thread isn't stickied
I've made it as Sticky again now. Probably won't see another occurrence for ages now.
0
reply
BBeyond
Badges: 5
#10
Report 4 years ago
#10
(Original post by Mr M)
I've made it as Sticky again now. Probably won't see another occurrence for ages now.
Yeah but that shows the thread is serving its purpose.

Edit: Nvm I'm blind or you just edited it
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! (446)
37.93%
No - but I will (88)
7.48%
No - I don't want to (80)
6.8%
No - I can't vote (<18, not in UK, etc) (562)
47.79%

Watched Threads

View All