math p1 help nedddeed

[Mueez]

http://www.xtremepapers.me/CIE/Internat ... _qp_12.pdf
q.7 last part

 

[ahmed t]

it will be x^2 +3
u must find a function that will transform G which is X-2 into F which is X^2-4X+7
if u square X-2 u get X^2 -4X +4
to tranform this into F u must add 3 to make the constant 4 into seven
so first u square then u add 3
X^2 +3


hope it helps

 

[arlery]

But how do we know we have to square it first?

 

[ahmed t]

see if u +3 firt then it will be X+1 squaring that u will get x^2 +2X +1 which is not F
u shud be able to relise instantly the connection between X-2 and X^2 +4x
after that u can add or subtract the amount u need to get the given constant