Logarithms AQA

ta225

Does anyone know where I can find revision notes for AS level logarithms?

Thanks!

Reply 1

ZdYnm8vuNR

There cant be that many notes can there? For edexcel all you need to know is:

•

A^b = x so log_A(x) = b

•

You can't take the log of a negative number or with base 1

•

"log(X)" means log base 10 of x

•

"ln(x)" means log base e of x

•

log(A^b) = b * log(A)

•

log(A * b) = log(A) + log(b)

•

log(A / b) = log(A) - log(b)

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log_b(A) = log_x(b) / log_x(A)

•

if log(A + x) = log(B), then A + x = B

I can't think of anything else, can anyone add anything?

Reply 2

ta225

Original post by ZdYnm8vuNR

There cant be that many notes can there? For edexcel all you need to know is:

[ul]
[li]A^b = x so log_A(x) = b[/li]
[li]You can't take the log of a negative number or with base 1[/li]
[li]"log(X)" means log base 10 of x[/li]
[li]"ln(x)" means log base e of x[/li]
[li]log(A^b) = b * log(A)[/li]
[li]log(A * b) = log(A) + log(b)[/li]
[li]log(A / b) = log(A) - log(b)[/li]
[li]log_b(A) = log_x(b) / log_x(A)[/li]
[li]if log(A + x) = log(B), then A + x = B[/li]
[/ul]
I can't think of anything else, can anyone add anything?