Teaching DSSSB PGT Mock Test 2025 Mathematics Limit and Continuity Continuity of a function

The interval, in which the function f(x) = 2x3 + 3x2 − 12x − 4 is monotonically decreasing, is :

1
]−∞, −2[
2
]−2, 1[
3
[1, ∞[
4
The function is always increasing.
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