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A helicopter is flying along the curve given by y – x 3/2 = 7, ) 0 x ( ≥ . A soldier positioned at the point ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 7 , 2 1 wants to shoot down the helicopter when it is nearest to him. Then this nearest distance is -

1. 3 7 6 1
2. 6 5
3. 2 1
4. 3 7 3 1

Correct answer: 3 7 6 1

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