Let A be a given positive constant and g(x)=2x-Ax^2

a. Show that if fixed-point iteration converges to a nonzero limit, then the

limit is p=1/A, so the reciprocal of a number can be found using only

multiplications and subtractions

b. Find an interval about 1/A for which fixed-point iteration converges,

provided p0 is in the interval

Can any one help with this problem