Member • Feb 11, 2006

## Some proofs to be solved

I got some very tricky problems to be solved...i need to submit it on friday to my prof..but i already have 2 tests this week..so i am not able to find time to solve this proofs...if any one can solve them..it wud be gr8.

here we go..

Prove/Disprove the following proposition

1. x is real, (x sqr)>(x)

2. x is real, (xsqr)>(x+1)

3.n is natural no, (n cube-n) is divisible by 3.

4. x is real , (x cube) > (x sqr)

5.x,y, real, x sqr+ y sqr=9.

6.n is natural no, (n cube +2n) is divisible by 3.

7. N is natural, 2(n+2) (less or equal to)(n+2) sqr.

do reply if u know the proof..