Which function has real zeros at x=3 and x=7

Any function that has (x-3) and (x-7) (or its unfactored equivilent)

ex: f (n) = (x-3) (x-7)

Step-by-step explanation:

because, when x equals 3 or 7, the output would equal 0

f (x) = x2 - 10x + 21