[Video Solution] f:R \to R be defined asf(x) = \left\ \matrix - 55x, & if\,x < - 5 \cr ... | ASPIRE STUDY

f:R \to R be defined asf(x) = \left\ \matrix - 55x, & if\,x < - 5 \cr 2x^3 - 3x^2 - 120x, & if\, - 5 \le x \le 4 \cr 2x^3 - 3x^2 - 36x - 336, & if\,x > 4, \cr \right. Let A = x \in R : f is increasing. Then A is equal to : | Watch the step-by-step video solution for this NIMCET PYQ.