Graph of a constant function , f ( x ) = k , where k is constant , is a line parallel to x-axis . Domain = R & Range = { k }.
Graph of polynomial f ( x ) = a0 + a1x + a2x 2 + ...+ an x n where n is a nonnegative integer & a0 , a1 , a2 ,..., an∈ R . , depends on f ( x ). Domain = R & Range = depends on f ( x ) .