Increasing Interval of Function f(x) (Jee Mains) | ExamDuo
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Application of Derivates
Medium
Increasing Interval of Function f(x)
Let
f
: R → R be defined as
f
(x)=
-55x ,
If x < -5
2x³ - 3x² - 120x
, if -5 ≤ x 4
2x³ - 3x² - 36x - 336
, if x ≥ 4
Let A={x ϵ R.
f
is increasing}. Then, A is equal to
SELECT ONE OPTION
A
(-∞ , -5) ∪ (4 , ∞)
B
(-5 , ∞)
C
(-∞ , -5) ∪ (-4 , ∞)
D
(-5 , -4) ∪ (4 , ∞)
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