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# Logarithm Equations - Is the Right? watch

1. im working through ka stroud engineering mathematics and this has got me stumped. ive got to the bit where x^2/x-1.
but how the hell does that equal x-2

need help before i headbutt a wall
2. (Original post by sebe0062)

im working through ka stroud engineering mathematics and this has got me stumped. ive got to the bit where x^2/x-1.
but how the hell does that equal x-2

need help before i headbutt a wall
log(rubbish) = log(garbage)

then this implies

rubbish = garbage
3. (Original post by TeeEm)
log(rubbish) = log(garbage)

then this implies

rubbish = garbage
what?
dyou understand the problem?
4. (Original post by sebe0062)
what?
dyou understand the problem?
I hope so ....
5. (Original post by sebe0062)
what?
dyou understand the problem?
You seem to have created another thread for the question. TeemEm has given an example for clarity. Look on the paper. LHS means left hand side. Now look on the right hand side
6. Here's a lemma for you.
Log_a (w)=Log_a (p)
This would imply w=p

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7. (Original post by sebe0062)
what?
dyou understand the problem?
They've just simplified the LHS, so the equation is basically

Then they've set

in order to find x. They're NOT saying it's true for all x!
8. so basically all it is implying is that;

i get that now.

what is the rest of it trying to say??

honestly never been so confused, i seem to be getting things right but missing out little bits which make me mess up
9. (Original post by sebe0062)
so basically all it is implying is that;

i get that now.

what is the rest of it trying to say??

honestly never been so confused, i seem to be getting things right but missing out little bits which make me mess up
The only difference between the LHS and the RHS is what's inside the brackets.
10. okay i might get it now! feel such a fool.
its so annoying as i know i can do maths but my problem is finding the solution when things arent laid out the way they should be
11. whats worse is im meant to be studying engineering next year. and im honestly not feeling like ill be able to achieve in the maths part of things

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Updated: October 20, 2015
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