HP 9g Mode D'emploi page 159

(1) 2 X 2 – 7 X + 5 = 0
[ ]
2 [ ] [ ( – ) ] ] 7
[ ] 5
[ ]
(2) 25 X 2 – 70 X + 49 = 0
[ ]
RUN
X 1 = 2.5 , X 2 = 1
X = 1.4
F-72