A soldier, placed at (3, 7), wants to shoot down the helicopter when it is
nearest to him Find the nearest distance Solution For each value of x, the helicopter’s position is at point (x, x2 + 7) Therefore, the distance between the helicopter and the soldier placed at (3,7) is
2
2
2
(
3)
(
7
7)
x
x
−
+
+
−
, i