For 25p2−15p+2:
α+β=2515=53,αβ=252
Let the new zeroes be S1=3α1 and S2=3β1.
Sum of new zeroes S=S1+S2=31(αβα+β)=31(2/253/5)=31(215)=25.
Product of new zeroes P=S1S2=9αβ1=9(2/25)1=1825.
Required polynomial is k(x2−Sx+P)=k(x2−25x+1825).
Taking k=18, polynomial is 18x2−45x+25.