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If the domain of the function f(x) = 2 2 x 25 (4 x ) − − + log 10 (x 2 + 2x – 15) is (– ∞ , α ) ∪ [ β , ∞ ), then α 2 + β 3 is equal to :

1. 175
2. 150
3. 125
4. 140

Correct answer: 150

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