# Intergration helpWatch

#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
0
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
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

Posted from TSR Mobile
0
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
#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
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
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
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
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
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
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