Maths & Physics Help

[shivluvchem]

We dont have log in our sylabus!
And the ans is not 1 it is 0!
It says in the marking scheme!

[astarmathsandphysics]

f(x)=log10x
and f-1(x)=10^x
so if you start with 1, you get log1=0 then 10^0=1, but it is irrelevant. It is just to do with f and f-1. You wnd up with the thing you started with

[shivluvchem]

Sorry but i didn't understand!

[astarmathsandphysics]

Think of powers. x^2*x^-2=1
but but f(f-1(x))=x
an inverse to f undoes f so you end up with what you started.

[igvictim]

Hi,

I am about to have my science paper 3 IG very soon, and I was wondering which are the most common physics equations that appear in this paper.

thank you

[xygoninator]

huh? shouldn't it be 1 root 10? and the answer without log should be 3.16?

[shivluvchem]

xactlie...
Its a question frm nov 2005...ppr 2!
Im confused!!Help!!!!

[astarmathsandphysics]

here is a forula sheet

[igvictim]

sorry but, how I open it? it is a DOS app

[astarmathsandphysics]

try this

[sonali]

hey this is seriosly tough
plzz crack this fr me
plzz give full details oh hw to get to d ans
q. when each edge of a cube is decreased by 1cm, its volume is decreased by 91cm^3 (i mean 91cm cube). find the lenghth of d side of d original cube.
u hv to form eq n solve this

[astarmathsandphysics]

orig volume=x^3
new volume=(x-1)^3=x^3-3x^2+3x-1
equation is x^3-(x^3-3x^2+3x-1)=91
ie 3x^2-3x+1=91
3x^2-3x-90=0
x^2-x-30=0
(x-6)(x+5)=0
x=6 or -5
but it must be 6 since x must be positive.

[badboy]

yoo pipo am duin maths paper 2 extended on 5th november can any 1 help with questions of maths  n also chemistry and physics

[astarmathsandphysics]

post questions here and i will help. for some to do goto www.freexampapers.com

[badboy]

yo astarinmaths n physics cum onlin ive added u in msn hotmail