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math C1 doubt

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halosh92:
  hello , its a silly 1 mark question but i just dont get it:
maths edexcel
C1
2008 JAN
Q6 part c


and one more question:
 2008 jan
Q 7 part d

staceyboy3:

--- Quote from: halosh92 on December 03, 2009, 08:09:10 pm ---  hello , its a silly 1 mark question but i just dont get it:
maths edexcel
C1
2008 JAN
Q6 part c


and one more question:
 2008 jan
Q 7 part d

--- End quote ---

Where do you get edexcel past papers? I wanna see the question :)

vanibharutham:
The maximum point on the curve with equation y = f(x + a) is on the y-axis.
(c) Write down the value of the constant a.

You can see that the maximum point on f(x) is at (2,5)
However, the question states that the maximum value of f(x+a) is on the y-axis, so we need to apply some transformation to f(x) to allow it to reach the y-axis...

Quite simply, a = 2

because f(x+2) moves f(x) 2 units to the left

and hence the maximum will be on (0,5) which is on the y axis :)

vanibharutham:
(d) write down the value of x2008.

First thing, dont freak out if u see some huge number like that, because thats exactly what they want u to do, but there is a trick.

From part (c) you should have deduced that p = -1.5

Now the way i would do this is as follows:

Using the iterative formula, i would x2, x3, x4 and so on

Hence,

x1 = 1 (given)
x2 = -0.5
x3 = 1 (given)
x4 = -0.5

See the pattern?

All evens are -0.5
and all odds are 1

Hence, x2008 = -0.5

:)

halosh92:

--- Quote from: vanibharutham on December 04, 2009, 06:51:24 am ---(d) write down the value of x2008.

First thing, dont freak out if u see some huge number like that, because thats exactly what they want u to do, but there is a trick.

From part (c) you should have deduced that p = -1.5

Now the way i would do this is as follows:

Using the iterative formula, i would x2, x3, x4 and so on

Hence,

x1 = 1 (given)
x2 = -0.5
x3 = 1 (given)
x4 = -0.5

See the pattern?

All evens are -0.5
and all odds are 1

Hence, x2008 = -0.5

:)


--- End quote ---

 thankx alot that was very gd,
but ummm i have one question, i never took this formula :"iterative formula"
do we always multiple by1, 2, 3, 4 in all cases ????

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