Mathematics Relations and Functions

যদি f : R → R দেওয়া হয়

f(x) = x3 + (a + 2) x2 + 3ax + 5

এক-এক, তাহলে a অন্তরালের অন্তর্গত

1
(-∞, 1)
2
(1, ∞)
3
(1, 4)
4
(4, ∞)

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