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Let λ ∗ be the largest value of λ for which the function f λ (x) = 4 λ x 3 – 36 λ x 2 + 36x + 48 is increasing for all x ∈ R. Then f λ ∗

1. + f λ ∗ (–1) is equal to
2. 36
3. 48
4. 64 (4) 72

Correct answer: 64 (4) 72

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