Maths, Addmaths and Statistics: Post your doubts here!

[Silentsea]

Re: O'level Maths, Addmaths and Statistics help available he

hrey please help me
Iam a student of 9th grade
I think i will take commerce next year
My extra subs will ne add maths stats and commerce ( its a subject too)
Can you tell me how to contact the british council and what are the months to register for ectra papers?
I ahve heard tht we can issue the forms from standard charter bank, and contact britsh council directly after some process.
PLZ HELP

 

[OakMoon!]

Re: O'level Maths, Addmaths and Statistics help available he

Visit www.britishcouncil.org.pk for further information.
Contact your school's examination office and ask them if you can give the exa next year on behalf of the school as that will be the best option.

Otherwise, for registering privately you can visit this website: http://www.britishcouncil.org/pakistan-exams-forms.htm

 

[CaptainDanger]

Re: O'level Maths, Addmaths and Statistics help available he

Hey Hamid need help...!

You can see the image below... I know how to do the b part but can you make the locus of D???? And post back the image? Or tell me how to do it? I got this wrong in my mocks exams... The last c part... I made the ADB angle 90° but that can be 90° anywhere? I mean the way I did it... So thats wrong...

 

[abcde]

Re: O'level Maths, Addmaths and Statistics help available he

You must have drawn the perp. bisector of AB in part (b). For (c), you just have to draw a semicircle (the diameter of which will be AB). Take the point at which the perp. bisector of AB and the line AB intersect as the centre of the semicircle and draw the semicircle on the opposite side of AB as C. Simple...
Did this help?

 

[abcde]

Re: O'level Maths, Addmaths and Statistics help available he

This is based on the fact that a diameter of a circle subtends a 90* angle at any point on the circumference of the circle.

 

[CaptainDanger]

Re: O'level Maths, Addmaths and Statistics help available he

You must have drawn the perp. bisector of AB in part (b). For (c), you just have to draw a semicircle (the diameter of which will be AB). Take the point at which the perp. bisector of AB and the line AB intersect as the centre of the semicircle and draw the semicircle on the opposite side of AB as C. Simple...
Did this help?

Ummmm... But how is ADB 90° then? It can be at more then one places? Thats correct then?

 

[CaptainDanger]

Re: O'level Maths, Addmaths and Statistics help available he

This is based on the fact that a diameter of a circle subtends a 90* angle at any point on the circumference of the circle.

Yeah I know that... But then it can be anywhere????? On the circumference?

 

[abcde]

Re: O'level Maths, Addmaths and Statistics help available he

You don't have to mark a single point, Captain. The question asks you to make the LOCUS of D so you draw a semicircle. I explained how above. And ADB will obviously be 90* if its on the circumference of the semicircle. Draw the semicircle and label it 'locus of D'. That's it! Hope you get it.

 

[CaptainDanger]

Re: O'level Maths, Addmaths and Statistics help available he

Oh alright!!!!! Got that.... Thnx!! I have done such other questions but they are straight forward... Love LOCI and CONSTRUCTION btw.... Love this question.... Zbrdst!!!!

 

[OakMoon!]

Re: O'level Maths, Addmaths and Statistics help available he

abcde has explained this perfectly.

 

[SalmanPakRocks]

Re: O'level Maths, Addmaths and Statistics help available he

yeah !!

 

[CaptainDanger]

Re: O'level Maths, Addmaths and Statistics help available he

abcde has explained this perfectly.

Yup she has...

 

[SalmanPakRocks]

Re: O'level Maths, Addmaths and Statistics help available he

can we post maths questions also ??

 

[CaptainDanger]

Re: O'level Maths, Addmaths and Statistics help available he

You mean here? Yes you can...

 

[SalmanPakRocks]

Re: O'level Maths, Addmaths and Statistics help available he

yeah !! ok thanks !!

 

[CaptainDanger]

Re: O'level Maths, Addmaths and Statistics help available he

n.p

 

[CaptainDanger]

Re: O'level Maths, Addmaths and Statistics help available he

Add bracket to the expression to make it correct

3+48÷4 into 6 - 1 = 4

Its quite simple I know... But I am just unable to do it.... :'( Give me hint for such type of question too...


Factorize this:

81x^4 - 16y^4

I need to know if I did that write...

 

[insomniac]

Re: O'level Maths, Addmaths and Statistics help available he

for the first one answer is straight 3+((48÷(4*6))-1)=4
and second one is
((3x+2)(3x-2))^2

 

[OakMoon!]

Re: O'level Maths, Addmaths and Statistics help available he

So many brackets are not required in the first question. 3+48÷(4*6)-1=4 will be good enough.

Your answer is wrong. I don't know how you eliminated y? :S And even if its +2y and -2y and you expand your answer you don't get back to where you started.
Let me explain this. By recognition you can see that the expression can be converted into a²-b². So it is ((9x²)²-(4y²)²). To factorise you need to apply the rule a²-b²=(a+b)(a-b), in this case a is 9x² and b is 4y².
We get (9x²-4y²)(9x²+4y²).. You can further factorise the first part of this expression i.e. 9x²-4y²=(3x)²-(2y)²=(3x-2y)(3x+2y)

So the final answer is (3x-2y)(3x+2y)(9x²+4y²)

 

[CaptainDanger]

Re: O'level Maths, Addmaths and Statistics help available he

for the first one answer is straight 3+((48÷(4*6))-1)=4
and second one is
((3x+2)(3x-2))^2

Thanks anyway...

So many brackets are not required in the first question. 3+48÷(4*6)-1=4 will be good enough.

Your answer is wrong. I don't know how you eliminated y? :S And even if its +2y and -2y and you expand your answer you don't get back to where you started.
Let me explain this. By recognition you can see that the expression can be converted into a²-b². So it is ((9x²)²-(4y²)²). To factorise you need to apply the rule a²-b²=(a+b)(a-b), in this case a is 9x² and b is 4y².
We get (9x²-4y²)(9x²+4y²).. You can further factorise the first part of this expression i.e. 9x²-4y²=(3x)²-(2y)²=(3x-2y)(3x+2y)

So the final answer is (3x-2y)(3x+2y)(9x²+4y²)

Thanks Alot