# pure 2 modulus QWatch

This discussion is closed.
#1
From jan 2003 ocr pure2 paper

the function g is defined by

g(x) = {2x-1}+4, x<0

Find an expression for g^1(x).
0
14 years ago
#2
What does { denote?
0
14 years ago
#3
I wouudl assume modulus and that he means [2x-1] and either forgot or pressed shift be accident
0
#4
sorry ye i did press shift by accident, ws supposed to [ ] (modulus sign)
0
14 years ago
#5
|2x-1| for modulus surely! (use the key next to 'z')
0
14 years ago
#6
y=|2x-1|+4
y-4=|2x-1|
2x-1=+-(y-4)
Since x<0,
2x-1=-(y-4)=-y+4
Make x subject of the formula
--> x=(-y+5)/2
--> g`(x)=(-x+5)/2 for x<0
0
#7
okay sorry
didnt realise that was the key u had to use,
any ideas for the answer yet??!?
0
14 years ago
#8
See above.
0
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