Qualification > Math
[CIE] All Pure Mathematics (P1, P2 and P3) doubts here !
Arthur Bon Zavi:
--- Quote from: $H00t!N& $t@r on May 08, 2011, 03:19:30 pm ---yeah I know that...
I just wanted to know if the statement "whenever you have a(x + b)^2 + c ... c is always the range" is right or not...
--- End quote ---
Almost all cases. Look for the domain first by the way.
$H00t!N& $t@r:
--- Quote from: Fidato on May 08, 2011, 03:22:27 pm ---Almost all cases. Look for the domain first by the way.
--- End quote ---
ok thanks
$H00t!N& $t@r:
--- Quote from: Vin on May 02, 2011, 01:36:39 pm ---Q6 ii)
y = kx2 +1 & y = kx
equate the two to get k = 4 (follow up from the previous- but k2 - 4k = 0 )
equate k=4 in kx2 - kx +1 = 0 to get x = 1/2
equate x = 1/2 in one of the equations to get the y coordinate
Q 10
Expressing h in terms of x
Vol = 4 cm3 (given)
vol of object = x * 0.5x * h
4 = 0.5 * h * x^2
Change the sub. of formula to h to get h = 8/x2
Total Surface area (consider each side and add them up to make things easy)
= 2xh + 2*0.5*xh + 0.5 * x* x + 4/5 x * 5/4 x
solve, and substitute h = 8/x2 to get the desired answer.
ii)
dA/ dx = 1.5 * 2 * x + 24 * -1 * * x -1-1
= 3x - 24/x^2
equate this to zero to obtain the stationary point as 2
d2A/ dx2 = 3 - 24 * -2 * x -2-1
= 3 + 48/x^3
equate x =2 to get 9
since 9 > 0, point of minima
--- End quote ---
Thanks a lot Vin ;D I thought no one replied.
Vin:
No problem ;D
Okay, i have a stupid doubt which i cant waste my time on thinking on much.
http://www.xtremepapers.me/CIE/index.php?dir=International%20A%20And%20AS%20Level/9709%20-%20Mathematics/&file=9709_s09_qp_1.pdf
Q4 part i
-.-
SkyPilotage:
--- Quote from: Vin on May 08, 2011, 04:41:44 pm ---No problem ;D
Okay, i have a stupid doubt which i cant waste my time on thinking on much.
http://www.xtremepapers.me/CIE/index.php?dir=International%20A%20And%20AS%20Level/9709%20-%20Mathematics/&file=9709_s09_qp_1.pdf
Q4 part i
-.-
--- End quote ---
Ahaha it happens....Actually its not stupid :D
-For c:
-----Substitute x=0 to get c=3
-For a:
Remember max value of sinx is 1 and min is -1.. so substitute sin(bx)=1 --->9=a(1)+3---->a=6
-For b:
The graph oh sinx has a whole wave from 0 to 2pi but here there are 2 curves in the domain 0 to pi...Therefore B=2...
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version