Core 2 Help!!! URGENT

Original post by SeanFM

There is no need to post a solution - it is also against the forum's guidelines. It doesn't help as much as guiding the OP with hints. (plus, they also have a mark scheme so a solution will not be much use).

Oh fair enough. I'm still new to this site, apologies.

Find the area under the line y = 10 first. Use the knowledge of the other line to estimate the line under the curve.

Hint - you can define two integrals that have the same limit.

(edited 7 years ago)

Reply 4

Kevin De Bruyne

21

Original post by nwmyname

Oh fair enough. I'm still new to this site, apologies.

Find the area under the line y = 10 first. Use the knowledge of the other line to estimate the line under the curve.

Hint - you can define two integrals that have the same limit.

Thank you. :h:

it's okay, I made the same mistake myself.

Reply 5

Nice n easy...

to find co-ordinates do 10=x^2+2x=2 as the lines intercept at y=10....so x^2+2x-8=0 factorise you get (x-2)(x+4) so x=2 or -4

to integrate your finding the area under the curve between x=-4 and x=2 which is the unshaded bit

so integrating (x^2+2X=2) you get I= (1/3X^3+X^2+2X) so then do top-bottom ( 1/3(2)^3+(2)^2+2(2) ) - ( 1/3(-4)^3+(-4)^2+2(-4)) so you get 24

so now the area under the curve is 24(the unshaded bit between x=-4 and X=2 so to find the shaded bit find the area of the square between X=-4 to X=2 to Y=10 so (4+2)*10=60 then minus the 24 which gets your 36.

Reply 6

why you doing c2 now? exam are done

Reply 7

Original post by TSRPAV

why you doing c2 now? exam are done

Some people tend to start now upon their retake.
Strange, but true.
I don't know if this is the case for here.

Reply 8

Original post by nwmyname

Some people tend to start now upon their retake.
Strange, but true.
I don't know if this is the case for here.

oh ok, you doing c3 tomorrow?

Reply 9

Original post by TSRPAV

oh ok, you doing c3 tomorrow?

aha no i'm starting the c3 module.
Are you doing C3 tomorrow?

Reply 10

Original post by nwmyname

aha no i'm starting the c3 module.
Are you doing C3 tomorrow?

yeah i do and c4 on friday :biggrin:

ah alright ahah good luck and keep ahead, it will get messy :wink:

make sure to master differentiation cos integration is 100x harder at first but once you master that c3 and differentiation is easier than c1. If i were you id do some small pre reading over summer and then work ahead of the class when you get back. i got a C last year at As and now im targeted A* which is actually achievble now cos of it :biggrin:

, key topics to master are c3 Trig and identities and differentiation and C4 integration. Good luck

Reply 11