Question

Find the range of the function f(x) = 6x + 3– x + 6–x + 3x + 2.

Answer 1

Given f(x) = 6x + 3– x + 6–x + 3x + 2.

= (6x + 6–x) + (3x + 3– x) + 2 ≥ 2 + 2 + 2 = 6

Thus, Rf = [6, ∞)