Answer to part a is 2.58
#stuck on part c
celest cargo
iron musk
Answer to part a is 2.58
im gonna look at it
celest cargo
alright where does this 4x come from
iron musk
sorry which part you mean?
celest cargo
c
iron musk
alright where does this 4x come from
i think what i would do is i would plit them up
celest cargo
yeah but im not sure how they get the 2nd line in the markscheme
iron musk
yeah but im not sure how they get the 2nd line in the markscheme
i see what they did
you know how it is 2^x^2+1
they take out the 2 factor
to make it eaier to integrate
iron musk
but then how do u get this
the first equation they take out the 2 as a factor im pretty sur
sure
2(2^x^2-x)
im trying to figure out the 4x
safe ridge
I think what they’ve done is they’ve split 2x into -2x + 4x
Not sure why
Weird way to do it
celest cargo
what would be the easiest way to do it cuz im so confused
safe ridge
You’ve already done the hard work lol
iron musk
bu that 4 is unknown
iron musk
where did the 4 come from
safe ridge
That’s why it’s only 3 marks for a definite integral
iron musk
that is the thing im trying to figure out
safe ridge
I’ll send my working one second
iron musk
@safe ridge do you think the ms is wrong
safe ridge
You have to relate y to what the integral is in part c hold on I’ll show you
iron musk
-2x+4x=2x
ahh i get it now
because it is in the format of 2^x^2-x
@celest cargo
-2x+4x=2x
what they do is the plit it up
-2x+4x
i think that is why
celest cargo
but why tho?
ohh okay that makes sense, i just would never think of that lol. thanks
safe ridge
Yeah so in trapezium rule questions normally you use the answer that you’ve already calculated to find this new integral that they want
So next time they do that in a trapezium rule questions just look to find how that integral is related to what you already calculated before
It’s not always the case but a lot of the times it is
Do you sort of get it now? @celest cargo