Advanced Math practice question

Answer: A. f(x) > 1

2ˣ is always positive and can be made as small as you like, but never reaches 0. So 2ˣ + 1 takes every value greater than 1, but never 1 itself.

Why the other answers are wrong

B. f(x) ≥ 1

f(x) never actually equals 1, because 2ˣ never equals 0.

C. f(x) > 0

Values between 0 and 1 are never reached: 2ˣ + 1 is always more than 1.

D. All real numbers

Negative values and values below 1 are never reached.

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