Maths CIE 2013 oct/november Paper 21 help?!

[ryanfarooqi]

find fg(x) which is f(2x+7) which is equal to (2x+7)^2+(2x+7)-3

so 4x^2+30x+53

so p=4 q=30 and r=53

Can u explain me please

 

[Hamzeh S]

Can u explain me please

i just did what part u dont understand?

 

[ryanfarooqi]

i just did what part u dont understand?

all of it ow did you plug those numbers

 

[Hamzeh S]

all of it ow did you plug those numbers

you should study functions chapter from ur book

 

[ryanfarooqi]

you should study functions chapter from ur book

no i mean how did you get the values can you please direct me to a video or something and Hey can you tell me http://olevel.sourceforge.net/papers/0580/0580_s13_qp_41.pdf Q4 B(III) solve it and tell me ur answers

 

[joanna omar]

The width of the bridge will only matter if the train passes under it in such a way so it crosses it horizontally but the width won't matter if it passes parallel to it.so the length of the train is 120 divide that by the width of the bridge which is 20 for each 20 m of the train you will get 6.to find the time it takes for each 20 m of the train to pass under the bridge divide 20 by 40 you'll get 0.5,there are 6 parts of 20 m in the train so if you multiply that by 0.5 you'll get 3 seconds

ARE YOU SERIOUS how will the train pass on the bridge !!!!! its passes underr it dudee ! that why they said 12 is the width

 

[joanna omar]

Basicallly the top part of the bridge is above the train when it passes by !

 

[oahmed64]

How do u solve this

 

[ryanfarooqi]

guy how do solve matrix stretch i know the formula x-variant is (ko)
(01)

 

[ryanfarooqi]

Well todays paper was a real pain -_-

 

[Aerodan]

Well todays paper was a real pain -_-

You think so? I feel it was very easy compared to Paper 42 back in May if you did it or have seen it.

 

[Tiffygirly]

Did anyone do Paper 42 IGCSE Math?

 

[Tiffygirly]

I mean 41

 

[snipex]

2l7 it was totally easy

 

[Tiffygirly]

wasn't so easy for me. Did u do 41? In a question,was the description a shear or a Stretch in 41?

 

[Aerodan]

It was a shear

 

[Tiffygirly]

Yay! The one with 6 marks,what was ur answer?,the one with pen,pencil....

 

[Tiffygirly]

hum,then the scale factor was 2?

 

[Aerodan]

Shear factor 2 x axis invariant and the answer for the pencil and pen was 20, which many of my classmates got too

 

[Tiffygirly]

I didn't get the 20