Maths, Addmaths and Statistics: Post your doubts here!

[robinhoodmustafa]

Can anyone explain Q8, f part of maths Oct/nov 2012 paper 22 to me? Please?

This one? Even I have difficulty

 

[Khadija_1234]

This one? Even I have difficulty

Yes, that's the one :/

 

[Iishrak]

Yes, that's the one :/

use calculator

 

[robinhoodmustafa]

use calculator

How should I solve the above question.

 

[Steel Arm]

Firstlly you shoud have drawn the graph and all.....
now if u let y=1+2x^2 -x^3
therefore y=k as well
now the line y=k is a obviously a horizontal line......
so what you do is find the range from which this line y=k will meet the curve 3 times.....
you will see from the graph of prev part that between the point y=1 and y=2 any horizontal line between these points will meet the curve thrice
SOOOO
1<k<2
k lies between 1 and 2

 

[Khadija_1234]

Firstlly you shoud have drawn the graph and all.....
now if u let y=1+2x^2 -x^3
therefore y=k as well
now the line y=k is a obviously a horizontal line......
so what you do is find the range from which this line y=k will meet the curve 3 times.....
you will see from the graph of prev part that between the point y=1 and y=2 any horizontal line between these points will meet the curve thrice
SOOOO
1<k<2
k lies between 1 and 2

Thank you so much!

 

[Steel Arm]

Thank you so much!

it was no probs!!!!

 

[TheStallion-Reborn]

i need URGENT help with maths (D) june2000 paper2 question 10. please xplain it to me!

 

[robinhoodmustafa]

Firstlly you shoud have drawn the graph and all.....
now if u let y=1+2x^2 -x^3
therefore y=k as well
now the line y=k is a obviously a horizontal line......
so what you do is find the range from which this line y=k will meet the curve 3 times.....
you will see from the graph of prev part that between the point y=1 and y=2 any horizontal line between these points will meet the curve thrice
SOOOO
1<k<2
k lies between 1 and 2

>_< Damn! I left that part in my exam because I couldn't recall this y=k and intersection etc

Btw Thankyou Now I wont repeat this mistake in CIE. IA

 

[Steel Arm]

>_< Damn! I left that part in my exam because I couldn't recall this y=k and intersection etc

Btw Thankyou Now I wont repeat this mistake in CIE. IA

its no prob!!!

 

[TheStallion-Reborn]

Firstlly you shoud have drawn the graph and all.....
now if u let y=1+2x^2 -x^3
therefore y=k as well
now the line y=k is a obviously a horizontal line......
so what you do is find the range from which this line y=k will meet the curve 3 times.....
you will see from the graph of prev part that between the point y=1 and y=2 any horizontal line between these points will meet the curve thrice
SOOOO
1<k<2
k lies between 1 and 2

is this maths or add maths?

 

[Steel Arm]

thts maths i think..... wy????

 

[leylamew]

Hi.
I'm a little bit stuck on Question 9bi in 4024 May/June 2010 Paper 2. Help, please?

 

[TheStallion-Reborn]

thts maths i think..... wy????

because im appearing for maths n i nevve came across this!

 

[Steel Arm]

because im appearing for maths n i nevve came across this!

nnaahhh its maths..... Dont worry..... atleast u learned it now..........
Gud Luck wid Exams!!!!!

 

[Haris Bin Zahid]

Please anyone explain me (Q7-ii-b). I know the coordinates but am confused about the nature of the stationary point with a modulus function. How on earth can it be maximum?

 

[Steel Arm]

Please anyone explain me (Q7-ii-b). I know the coordinates but am confused about the nature of the stationary point with a modulus function. How one earth can it be maximum?

well modulus function means reflecting the graph of f(x) in the x-axis......
now automatically the minimum point will become a maximum
(since a reflection of a minimum pt in horizontal line gives a maximum point)

 

[Khadija_1234]

Hi.
I'm a little bit stuck on Question 9bi in 4024 May/June 2010 Paper 2. Help, please?

what region?

 

[Haris Bin Zahid]

well modulus function means reflecting the graph of f(x) in the x-axis......
now automatically the minimum point will become a maximum
(since a reflection of a minimum pt in horizontal line gives a maximum point)

But there are coordinates of y which are greater than 11.....

 

[Steel Arm]

But there are coordinates of y which are greater than 11.....

thts not a prob....... sure its tricky but still thts the way its done i think