Qualification > Math
IGCSE MATHS Doubts
Ghost Of Highbury:
--- Quote from: saleemsamer on May 18, 2010, 06:02:53 pm ---
Thank You but wat abt 4
--- End quote ---
check again.
@ksitna -
check the question again.
NidZ- Hero:
--- Quote from: ~VIN1094~ on May 18, 2010, 06:04:05 pm ---which one u talkin abt ?? u didnt get it ??
--- End quote ---
2006 m/j 2 d its 4 marks
saleemsamer:
--- Quote from: A@di on May 18, 2010, 06:07:08 pm ---check again.
@ksitna -
check the question again.
--- End quote ---
Thank You :)
Kojoudeh95:
Can some1 plz tell me a good way of finding the scale factor of a shear and stretch??? And wat should u say wen they tell u describe a transformation: 1) shear description
2) stretch description
PLZ and thx :D
Ghost Of Highbury:
--- Quote from: aangel42 on May 18, 2010, 06:06:07 pm ---Hi guys,
I'm new here... Been reading these posts for a couple days now, but just didn't have any personal questions. UNTIL NOW.
I have a problem with a function graph - I need help with O/N 2001 Paper 4, question 6a.) iii.
How do you use a graph to find an inverse function?
If anyone could explain, I'd REALLY appreciate it - Paper tomorrow!!! Thanks :)
(paper + mark scheme attached)
--- End quote ---
ok look
first u have to understand wats the relation b/w g(x) and g-1(x)
e.g : say g(x) = x+2
thus, g(2) = 4
g-1(x) = x-2
now, if u apply 4 in g-1(x) , u will get 2
another e.g - g(4) = 6, apply 6 in g-1(x) and u get 4
same thing here...they've asked g-1(-0.5)
meaning, wat do u have to apply in g(x) to get -0.5 ?? meaning g(x) = -0.5, y = g(x), thus, y = -0.5...draw this line and see where it intersects y = g(x)
from the graph , it intersects at x = -1
this means that if u apply -1 in g(x) u get -0.5
thus if u apply -0.5 in g-1(x) u'll get -1.
:D
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