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Let S( α ) = {(x, y) : y 2 ≤ x, ≤ α } and A( α ) is area of the region S( α ). If for a λ , 0 < λ 4, A( λ ) : A

1. = 2 : 5, then l equals :
2. 3 1 25 4 4 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛
3. 3 1 5 2 2 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛
4. 3 1 5 2 4 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ (4) 3 1 25 4 2 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛

Correct answer: = 2 : 5, then l equals :

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