Answer:
(5,27)
Step-by-step explanation:
parabolas are symmetrical around the vertex. therefore x axis crossing points are equidistant from the vertex.
f(x) cross x axis when x=2 and x=8
the mid point of 2 and 8 is 5.
f(5)=-3(5-2)(5-8)
f(5)=27
vertex=(5,27)
