Edexcel A2 C3 Mathematics 12th June 2015 Watch

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ACarter8
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#2481
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#2481
Last question, was it increasing or decreasing?
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Seanj15
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#2482
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#2482
(Original post by emu_neutrino)
didnt it say after that, why does g(x) not have an inverse? and how did you manage to work out an inverse for that, it was a very messy function. since it said hence in part b, i put g'(x) =0 and found the x coordinates of the turning points then used these to find the y values which had e in them, the graph had two turning points which is why i did that. also the hint from the previous q to use g'(x).
What x coordinates did you get ?
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DiggingLake
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#2483
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(Original post by Ripper Phoenix)
Absolutely increasing function


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I got confused on that by the negative constant and so have got the answer wrong (thought it decreased, tending to 1, rather than increased tending to one).
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Ripper Phoenix
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#2484
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(Original post by MelonKuma)
Pretty sure that x was 2 and 0.5
Absolutely correct but u had to put it in y


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delpetra
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#2485
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(Original post by cmfunk)
Guys for the coordinates of A with the question with pie/2, did we have to give the coordinates as exact. I gave it as a decimal.
It definitely didn't say it had to be exact so I gave it as something like (0, 1.something) so surely they have to accept that? It would have taken much longer to get an exact answer.
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MathsAddict
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#2486
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#2486
June 2013 was much easier imo compared to this one. I couldn't solve certain questions that pissed me off i had over 34 mins to dwell on parts of 3 different questions.
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Mishy96
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#2487
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#2487
(Original post by Isymega)
Guys why couldn't you do the inverse of the function??!!??
I done the same thing! Tried for 20 minutes and then realised it was asking for diffentiation not inverse aha 😂
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Naika98
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#2488
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#2488
How did I get fx equaled something that factorised to (6x-4)(x-1)? Anyone else get something similar?

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Ripper Phoenix
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#2489
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(Original post by DiggingLake)
I got confused on that by the negative constant and so have got the answer wrong (thought it decreased, tending to 1, rather than increased tending to one).
I sketched mine it was increasing


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Toriar
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#2490
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#2490
That was pretty challenging but I think I managed to do most of it ok except for the trig identity which I got stuck on.
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piercy42
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(Original post by manlikem)
How the exam was? Let me tell you..
Halfway through that exam I checked the front to make sure it was actually c3.
dude how do i upvote this
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jf1994
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#2492
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#2492
(Original post by isherwood22)
An asymptote isn't necessarily something that it doesn't pass through - lines can intersect asymptotes so y=5 was still an asymptote as it tended towards that in the negative bit

oops, someone already said that!
An asymptote is defined as a straight line that a curve approaches but never touches.

The curve in this case was the mod of an exponential function

Clearly the curve crosses y=5 so it is not an asymptote
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IWantSomeMushu
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#2493
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#2493
Damn that was tough.
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bbadonde2
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#2494
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#2494
This is no joke, I soiled my pants when I saw question 8. It was really awkward as people could smell it but didn't know it was me
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Chazley123
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#2495
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#2495
(Original post by scales1996)
Knew I should've done English...
english is probably harder if not one of the hardest a levels man, maths is one of the easiest when you get into the thought process and flow of things
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delpetra
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#2496
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#2496
(Original post by dandroff)
its decreasing isnt it ? because it goes up but then goes back down ?
k was negative, meaning if you subbed a negative number into the numerator and denominator of the gradient function, they would always be positive. So gradient always positive, and the function is increasing.
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Elolel
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#2497
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#2497
(Original post by Mishy96)
I got 3.1 and 13.9..
I guess i got 13.9! Lost all my energy after i got stuck on the trig ques
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anndz3007
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#2498
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#2498
Here is my answer, in random order th
2p/1-p^2,1/(1-p square)^1/2, (p+1)/1-p
Ln7/2,ln3/2
51.8,-25.3
K>33/8
Coordinate=( 0,pi/3)
93 sec
3.1,13.9
-4e^-4<y<1/e something
Fx Decreasing
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frozo123
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#2499
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#2499
65/75 for an A*?
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ArtemMakushin
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#2500
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#2500
I'm not sure man, but I got a y coordinate being massive... Because the gradient of the line was 24pie for me... Did you get same?
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