hmmm, something odd about p2 edexcel paper...Watch
I just got the p2 paper we did a week or so back, and I can't seem to get 2b) right, must be maths block or something.
f:x ==> x^2 - 2x + 3, 0 =< x =< 4
g:x ==> lambda*x^2 + 1
gf(2) = 16, find out lambda
well f(2) = 2^2 - 2(2) + 3
f(2) = 3
gf(2) = g(3)
g(3) = lambda * 3^2 + 1
9lambda + 1 = 16
9lambda = 15
lambda = 15/9
Now I am sure that the square bit for the function of g wasn't on the test, because I definitely got 5. Where am I going disastrously wrong?
I swear the same thing happened to me in the P1 exam - one of the inequalities i'm sure had + signs but everyone ellse seemed to have got - signs.
Its just bloody weird
I have the exact paper I sat here in front of me, and there is NO ^2!! I am staring at it now and it says
g: |--> lX + 1 (l = lambda)
That is incredible, Edexcel must have screwed up some of them. There were no 'amendments' to be made AFAIK.
x^2 + 2x +3 instead of x^2 - 2x + 3
and i got 15/11 for lambda. funnily, i didn't have lamba(x^2 + 1)
something v fishy is going on here.
So its fine, he screwed up and we're ok. Few!