Math Online

Problem of the week 6 - square root(teacher)
Find all so that

Shortcut to calculate(ice_breaker)
I have an equation as below: 3 + 3^2 + 3^3 + 3^4 + 3^5 + 3^6 + 3^7 + 3^8 + 3^9 + 3^10 Note: ^ stands for exponent Anybody knows the shortcut to calculate that equation i/o multiplying and plus one

Limits of Average Rates of Change(Colleen Watt)
Evaluate this limit for the following values of x and function f. Lim h-0 f(x+h) - f(x) divided by h when f(x)=1/x, x=-2? Second Question Why is 2+7/x^3 divided by 1-1/x+1/x^2+7/x^3 = 2?

how to solve this equation ?(abdlaziz)
this is first time to me in this amazing forum can any body tell me how to solve this equation? factor this equation : x8+x4+1

Brain Teasers(Suparna)
Can anybody help me out by solving the Brain Teasers at http://www.3smartcubes.com/pages/tests/brainteaser Need your help :(

Shortcut to calculate(ice_breaker) Thanks a lot Teacher ...

Shortcut to calculate(teacher) a1 = 1/2 - the first number of the sequence q = 1/2 - common ratio n=10 ...

Shortcut to calculate(ice_breaker) This formula is provided by a friend of mine. He told me to use that formula to solve this equation. I think I'd better use yours to standardize my knowledge. By the way, if the equation is like: 1 ...

Shortcut to calculate(teacher) I do not think that here we can use that formula. Where you found it? Could I see, please? The geometric series formula is: a1 = 3 - the first number of the sequence q = 3 - common ratio (because ...

Shortcut to calculate(ice_breaker) Thank you Teacher. I did have a look at your given site and some sites thru Google. Finally, I figure out the solution as below: 3 + 3^2 + 3^3 + 3^4 + 3^5 + 3^6 + 3^7 + 3^8 + 3^9 + 3^10 1) Get out ...