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algebra
precalculus
survey of mathematics

Why do I keep getting that 1 equals -1 when I do the following?: `1=sqrt(1)=sqrt((-1)(-1))=sqrt(-1)sqrt(-1)=i*i=i^2=-1`
`4 answers available` `2005-07-19`	`Ed (Hybrid Math Instructor) ed@mathtoearth.org`

calculus
discrete mathematics
number theory
combinatorics

How do I show that `2^(2^n-1)` divides `2^n!`
`2 answers available` `2005-07-19`	`Kathy (MLC LIA) kathy@mathtoearth.org`

algebra
precalculus
calculus

What is an effective way to explain to a student how to find the range of the function `f(x)=(x^2-1)/sqrt(4pi-x)`?
`No answers available [Answer]` `2005-07-19`	`Sample (student) sample@mathtoearth.org`

precalculus

I was taught that the `log(x^2) = 2log(x)`.
A tutor just told me that the

function
`f(x)=log(x^2)` is not the same function as
`g(x)=2log(x)`.

Why?

1 answer available
2005-07-05 Sample (student) sample@mathtoearth.org