Let f:R R be defined as, f(x)= cases -55x, & x4 cases Let...

Question

Let f:R R be defined as, f(x)= cases -55x, & x<-5 2x^3-3x^2-120x, & -5 x 4 2x^3-3x^2-36x-336, & x>4 cases Let A = x R: f is increasing . Then A is equal to :

Accepted Answer

(D)

JEE Main 2021 Mathematics question

Solution