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Let the set of all values p ∈ R , for which both the roots of the equation x 2 – (p + 2)x + (2p + 9) = 0 are negative real numbers, be the interval ( α, β] . Then β – 2 α is equal to

1. 9
2. 5
3. 20
4. 0

Correct answer: 5

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