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sweetsh:
I wanted to say this

sweetsh:
Astar how do we solve this equation(additional maths) but using ln?
log2x-log4(x-4)=2
?

kenyas sweetheart:
hi, i need help in this question please:
may, june 03,
question 2b.
how do we find the speed? do we add? or minus? help pls, =)
and the same paper 7c.
whats the apparatus we need?
please help me!

astarmathsandphysics:
log2x=log4x2

we have log4x2-log4(x-4)=2

log4(x2/(x-4))=2

(x2/(x-4)=42 so x2=16(x-4)=16x-64

so x2-16x+64=0
(x-8)2=0 so x=8

astarmathsandphysics:

--- Quote from: kenyas sweetheart on April 24, 2009, 01:40:54 pm ---hi, i need help in this question please:
may, june 03,
question 2b.
how do we find the speed? do we add? or minus? help pls, =)
and the same paper 7c.
whats the apparatus we need?
please help me!

--- End quote ---

What course code is this question from?

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