Question

Let f(x) = [9^x – 3^x + 1] for all x ∈ (–∞, 1], then the range of f(x) is ; ([ . ] denotes the greatest integer function)

(A) {0, 1, 2, 3, 4, 5, 6, 7} 

(B) {0, 1, 2, 3, 4, 5, 6} 

(C) {1, 2, 3, 4, 5, 6, 7} 

(D) {1, 2, 3, 4, 5, 6} 

Answer 1

Correct Option :- (A) {0, 1, 2, 3, 4, 5, 6, 7}

Explanation :-