Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Abhi 1 Best Answer
let given polynomial is f(x). when we take derivative of f(x) then f'(x)=15x^4 +9 and f'(x) have complex roots which means f'(x)>0 for all x . So f(x) is strictly increasing function which means f(x) have only one root.