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Author Topic: P1 maths question  (Read 2151 times)

Offline I'm a mistake - legalize abortion!

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P1 maths question
« on: May 11, 2010, 12:43:17 pm »
hello can anyone solve q no.4 from M/J 2009 pastpaper ?
it is a graph question

The diagram shows the graph of y = a sin(bx) + c for 0 ? x ? 2p.
(i) Find the values of a, b and c. [3]
(ii) Find the smallest value of x in the interval 0 ? x ? 2p for which y = 0

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nid404

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Re: P1 maths question
« Reply #1 on: May 11, 2010, 12:46:07 pm »
I've answered this before...hold on...ill get you the link
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nid404

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Re: P1 maths question
« Reply #2 on: May 11, 2010, 12:49:18 pm »
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Offline I'm a mistake - legalize abortion!

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Re: P1 maths question
« Reply #3 on: May 11, 2010, 01:10:04 pm »
thanks man you are the best  ;D
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nid404

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Re: P1 maths question
« Reply #4 on: May 11, 2010, 01:12:41 pm »
You're welcome  :) :P
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Offline Saladin

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Re: P1 maths question
« Reply #5 on: May 11, 2010, 01:25:16 pm »
Quote from: lord kratos on May 11, 2010, 01:10:04 pm
thanks man you are the best  ;D

its a she! LOL
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Offline I'm a mistake - legalize abortion!

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Re: P1 maths question
« Reply #6 on: May 11, 2010, 05:40:35 pm »
oops!! i am sorry nid. :-[
I didn't see the sign
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nid404

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Re: P1 maths question
« Reply #7 on: May 11, 2010, 05:45:04 pm »
lol ...it's k  :D
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Offline AN10

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Re: P1 maths question
« Reply #8 on: May 11, 2010, 07:08:58 pm »
hey i have one confusion....when the question says that roots are REAL then is disriminant greater than or equal to 0,,,,,,OR only greater than 0,,,,,i hope u get what i mean.
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nid404

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Re: P1 maths question
« Reply #9 on: May 11, 2010, 07:10:41 pm »
real roots >0
repeated root=0
no roots <0
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Offline ifraha18

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Re: P1 maths question
« Reply #10 on: May 11, 2010, 07:30:16 pm »
the function f is such that f(x) = (3x + 2)3 ? 5 for x ? 0.
ii) Obtain an expression for f?1(x) and state the domain of f?1.
..????
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nid404

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Re: P1 maths question
« Reply #11 on: May 11, 2010, 07:31:16 pm »
what is the ? in ur question
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Offline ifraha18

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Re: P1 maths question
« Reply #12 on: May 11, 2010, 07:32:29 pm »
The function f is such that f(x) = (3x + 2)3 ? 5 for x ? 0.

wht is finverse of x.?n its rannge..june 2008 ppr 1 q6.
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Offline ifraha18

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Re: P1 maths question
« Reply #13 on: May 11, 2010, 07:35:46 pm »
(3x+2)^3_5  for X>0

wht is finverse.?n its range.?
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nid404

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Re: P1 maths question
« Reply #14 on: May 11, 2010, 07:38:46 pm »
ohk..

here

y=(3x+2)^3 -5
to get inverse you make x the subject
y+5=(3x+2)^3
3\sqrt(y+5)=(3x+2)
3\sqrt(y+5)-2= x
       -------------
         3
f^(-1)(x)=3\sqrt(x+5)-2
                      -------------
                       3

now range of f(x)= domain of f-1(x)
range of f(x) can be as the domain for it is given as x>=0
sub 0 in f(x) y>=3

this is the domain of the  inverse function
D of f-1(x) x>=3
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