5.2 polynomials

polynomial.rb

def poly1(a, x)
  n = a.size
  a0 = a.last
  a.delete_at(n-1)
  if a.size == 0
    p = a0
  elsif
    p = x * poly1(a, x) + a0
  end
  p
end

def poly2(a, x)
  puts a
  n=a.size
  r=0
  a.each_with_index do |c, i|
    r += c*x**(n-i-1)
  end
  r
end