Qualification > Math

IGCSE MATHS Doubts

<< < (82/240) > >>

Mr.DitD:
Hello everyone!!

I had a confusion about the decimal points. When exactly do we have to put decimal point and we do we have to write whole number?!?!  ???

haris94:

--- Quote from: A@di on May 11, 2010, 04:44:32 pm ---y = 10x

x = 10^y

log x = y

f(-1) x = log x

f^(-1) 1 = log 1 = 0

longer method..

which paper is this from?

--- End quote ---

this is from O/N 2005

Ghost Of Highbury:

--- Quote from: haris94 on May 11, 2010, 05:09:10 pm ---this is from O/N 2005

--- End quote ---

check d easier method i posted

haris94:

--- Quote from: A@di on May 11, 2010, 04:47:16 pm ---if u havent learnt log. try this method

f-1(1) means, for what value of x in 10x will u get 1

answer = 0

for e.g f(x) = x+2

          f-1x = x-2

f(2) = 4

put 4 in f-1x and u shud get 2

4 -2 = 2

see?

simple.

--- End quote ---

o i c
yea this is much simpler
havent learnt log
this is the first question of its kind i hv seen though

Thanks a lot

Dibss:

--- Quote ---Hello everyone!!
I had a confusion about the decimal points. When exactly do we have to put decimal point and we do we have to write whole number?!?!  Huh?
--- End quote ---

if the number is not exact (i.e. it continues after a decimal until the end of your calculator display) you have to give the answer to three significant figures.
write a whole no. only if they specify or if the answer is exact e.g. 517
if the answer is in degrees, give the answer to one decimal place
:]

Navigation

[0] Message Index

[#] Next page

[*] Previous page