Edexcel C2 20th May 2015 *Official Thread*

Have you got it now? Sub a back into any of the equations
then to understand what you've done
Solve

sin(ax-b)=0 0<x<360 ( the inequality sign meant to be or equal to )

so let (ax-b)= theta

so values are 0, pi, 2pi
then add b, divide a
each of your values
you should get what the coordinates are in the question

So guys, ive summed up my very dumb maths doubts, very simple and quick to answer like weird equations etc, can any one show me a paper work solution of these, if not, one of these? Its hell important, as my basics realllyyy sucks! Please help!

Ahh, that makes sense! So it'll be 0+b/2 which must equal pi/10..which is why b is pi/5? I don't think I'll be able to do this in an exam though :/

Thanks

I'm not sure whether because the sun is blinding my view or your pdf file is upside down

So guys, ive summed up my very dumb maths doubts, very simple and quick to answer like weird equations etc, can any one show me a paper work solution of these, if not, one of these? Its hell important, as my basics realllyyy sucks! Please help!

okay first one, I don't know where the 25 comes from
but the square root of y
because log5y= b
1/2log5y=1/2b
and 1/2log5y is the same as log5y^1/2
ask someone else about the 25.. sorry!

second one you could put x1/3 as the denominator and then multiply everything by x1/3 to get rid of the negative power
so you'll get -x^1/3=-2
then solve for x

third one well cubing it is (2root2)(2root2) which is 8 so then another 2root2 is 16root2 then you can subtract as the roots are the same
fourth one it's an arithmetic sequence so use the formula Sn= blah blah
there will be 21 terms if you think about it because the 10 and 30 are inclusive
so Sn=10.5(54+(21-1)2)

3tan^2theta -1=0
you put the 1 on the other side then divde by 3 and solve it how you would
if you don't know how to solve it let me know

next one you put the -1/2 as the denominator
then multiply every term by 1/2
so you'll get x^2-8=0
then solve for x
next one turn it into a top heavy fraction so (49/9)^-1/2
flip it because the power is negative so (9/49)^1/2 then square root each term

final one, you multiply every term by x to get rid of the denominator then multiply by 2 to get rid of the 2
although I don't get how that equals what you've written down
ask someone else

hope that helps!

are you an international student or something? cus half of that is c1

bro, firstly thank you so much for such a great help!

Just the 3tan^2 one, i solved it properly but they are asking to give the answer in terms of Pie, now how do you express this number in terms of pie?

Next, the one you told for - x^1/3 = -2 how to solve this equation? i really dont know :P

and the 2 under root 2 one if you cube it out how will you end up with 8?

And yes you guessed right, im international have C12 on wednesday..

bro, firstly thank you so much for such a great help!

Just the 3tan^2 one, i solved it properly but they are asking to give the answer in terms of Pie, now how do you express this number in terms of pie?

Next, the one you told for - x^1/3 = -2 how to solve this equation? i really dont know :P

and the 2 under root 2 one if you cube it out how will you end up with 8?

And yes you guessed right, im international have C12 on wednesday..

was it tan^2theta=1/3 ?
square root both sides
so you get tantheta= +-root3/3
put your calculator in radians mode
it should work use a graph of tan to work it out
or CAST but graph is better
and its aite

Cube both sides


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1 more question i had forgot, how to factorise, 2x^3 - 16 ?

Why is arⁿ used instead of ar^n-1 in question 6 January 2010?

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You can't

1 more question i had forgot, how to factorise, 2x^3 - 16 ?

X=2 is asolution so divide by x-2


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