Hello!!!

I am new in this forum, and it seems really interesting !

Could you help me with some exercises? I would be grateful !

1) f: R -> R , f(x)=(x-1)(x-2)(x-3)(x-4) , then f(R)=...?

// R=the multitude of real numbers

2) if p is a natural and prime number and A={ k nr. integer, | sqrt(k*k-p*k)

is a natural number } , then the number of elements of A is .....?

3) If M={ m integer nr. | (m*m*m-3*m+2)/(2*m+1) is an integer nr.} , then the minimum and the maximum from M are ....?

Thank you very much!!!!