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CIE AS LEVEL Math..

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Stay10:
hey every1..needed sum help in math..is there any notes or reference materials tht could help me understand the range and domain of a function (basic overview)..gone through lotz of past papers nd found those question question tricky..so if any1 could explain me or any reference would be really appreciated...need it as soon as possible..nt much time left..Thanks  :)

Meticulous:
Post your questions. I will be happy to help.

Try www.astarmathsandphysics.com

Stay10:
..Thanks 4 the site..ll go through it..but i mean like i dont know wht it means..both range nd domain..there is a question in paper 12 of oct/nov 2009..no. 4..would really appreciate the explanation..

Stay10:
came across another question from the paper oct/nov 2008, question 7 (i) & (ii)..w8in 4 the reply..

Freaked12:

--- Quote from: Stay10 on May 09, 2010, 06:33:54 pm ---came across another question from the paper oct/nov 2008, question 7 (i) & (ii)..w8in 4 the reply..

--- End quote ---

Show that A =
(? + 4)x2 ? 160x + 1600
divided by pie

So the perimeter according to the question is 80 of both the shapes so as a result
x + x + x + x + 2(pie) r
4x+ 2 (pie)r=80
2(2x+ (pie)r)=80
2x + (pie) r= 40
We make r the subject
r= 40/(pie) - (2/(pie))x

we now substitute the r value into the equation (the area of both sides)
A= x square plus (pie) r square
x square + (pie)(40/(pie) - (2/(pie))x)square

which if you calculate



2) it depends on whether u have taken r or x the subject
in this case r
so we differentiate

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