Let f:R R be a function defined by loint Adi (x) = x + 5x +1îx 15, Then, which of the following statements is TRUE? Indifp Institute d (A) fis both one-one and onto (B)fis neither one-one nor onto (C) f is one-one but NOT onto (D) f is onto but NOT one-one suj 6uiziuet
f is both one one and onto..... because
f'(x) = 7x^6 +15x^2 +11 which is always greater than zero for all x belongs to R .
f(x) is strictly increasing function which intersect x -...