kitaangMa4ddie kitaangMa4ddie 07-06-2016 Mathematics contestada Which function has real zeros at x = 3 and x = 7? A. f(x) = x2 + 4x – 21 B. f(x) = x2 – 4x – 21 C. f(x) = x2 – 10x + 21 D. f(x) = x2 – 10x – 21