Original post by kieton123
(log3(81)+log3(243))/(log3(x)) = log3(x)
Need urgent help with this one.After simplifying the numerator, do I multiply both sides by log3(x) ?
Need urgent help with this one.After simplifying the numerator, do I multiply both sides by log3(x) ?
check my solution
Original post by kieton123
(log3(81)+log3(243))/(log3(x)) = log3(x)
Need urgent help with this one.After simplifying the numerator, do I multiply both sides by log3(x) ?
Need urgent help with this one.After simplifying the numerator, do I multiply both sides by log3(x) ?
Yes multiply both sides by log3x
you should end up with log3x squared =9
now square root both sides
log3x= +- 3
solve from there
Original post by kieton123
(log3(81)+log3(243))/(log3(x)) = log3(x)
Need urgent help with this one.After simplifying the numerator, do I multiply both sides by log3(x) ?
Need urgent help with this one.After simplifying the numerator, do I multiply both sides by log3(x) ?
3^4 = 81 and 3^5 = 243
therefore your equation is 4+5/log3(x)=log3(x)
let log3(x) be y and make a quadratic equation by multiplying everything by y
i got x as 243 and 1/3.
Original post by RizK
3^4 = 81 and 3^5 = 243
therefore your equation is 4+5/log3(x)=log3(x)
let log3(x) be y and make a quadratic equation by multiplying everything by y
i got x as 243 and 1/3.
therefore your equation is 4+5/log3(x)=log3(x)
let log3(x) be y and make a quadratic equation by multiplying everything by y
i got x as 243 and 1/3.
Apparently x is 27, Imran got the answer
Original post by kieton123
Apparently x is 27, Imran got the answer
I just checked and this is the way they have done it in the C2 book... mind telling me where you got the question from?
thanksOriginal post by RizK
3^4 = 81 and 3^5 = 243
therefore your equation is 4+5/log3(x)=log3(x)
let log3(x) be y and make a quadratic equation by multiplying everything by y
i got x as 243 and 1/3.
therefore your equation is 4+5/log3(x)=log3(x)
let log3(x) be y and make a quadratic equation by multiplying everything by y
i got x as 243 and 1/3.
Answer is
Original post by RizK
I just checked and this is the way they have done it in the C2 book... mind telling me where you got the question from? thanks
thanksOk man, its the "Revise Edexcel AS Mathematics AS Workbook"
Original post by Reda2
You're missing a solution >
You must also consider
Original post by edothero
You're missing a solution >
You must also consider
You must also consider
Just wanted to show him the solution, pretty sure he knows that.
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