C1 Maths AS aqa 2016 (unofficial mark scheme new)

im not sure

Posted from TSR Mobile

It definitely said 3 linear factors. But one was a repeated root. So I guess as long as you put (x-4)^2 I guess you'll get the mark

i just hope ~60 will be an A lol

that makes sense thanks a lot for clearing that up for me. So if I wrote, translation by vector (-1/2,41/4) as my answer. would I get two marks for that ?

k=20 and k=4

btw the question was show that the line and curve only intersect at one point, so you had to do b2-4ac=0 and it gave you k=4 k=20

great job on the mark scheme though looks roughly spot on

What was the question where you had to find the second derivative and then verify a maximum point where x = -1.5
I've seen 12x-27 as the second derivative but then people sub in and get 45 so minimum but shouldn't it be -45 and a maximum when x = -1.5

It should be 34right?

which question number was that ?
and thanks

You know for question 5d), to find the point B, do we use the mid point method to find it?

Posted from TSR Mobile

Yes, it was using the idea that C is the midpoint. Since AB is a diameter, the center of AB is C, meaning C is the midpoint of AB.

Since you know A and C, you can just literally use your head to work out B and just write the coordinate down, as it would be a mark for the x coordinate and a mark for the y coordinate.

if they are harsh they will not accept (x-4)^2 because it did say in the question three linear factors i know that it was a repeated root but aqa can be very stoosh with this stuff

Did that question using vectors :C Still got (12,-7)

well the co ordinate u had was x=-1.5 and u had to prove that was a minimum by first proving it was a stationary point (showing that the dy/dx of that x was zero) then subbing into second derivative to get a positive value which showed it was a minimum as second derivative was greater than 0