The maximum number of real roots of the equation `x^n+px+q=0,(n in N),` is

The maximum number of real roots of the equation x^(2n) -1 = 0 , is

The maximum number of real roots of the equation x^(2n) -1 = 0 , is

If p and q are the roots of the equation x^2+px+q =0, then

If p and q are the roots of the equation x^(2)+px+q=0 , then

Maximum number of real solution for the equation ax^(n)+x^(2)+bx+c=0,"where "a,b,c in R and n is an even positive number, is