The quadratic function f(x)= px^2 + qx + r has f(0)= 35,f(1)=20 and f(2)=11.

Find the values of the constants p,q,r.

Express f(x) in the form a(x+b)^2+c. Use your answer to find the smallest value of f(x).

The only thing I know is r=35 (I think)

please help

thank you