16Hit1600
Advanced MathEasy–MediumInput giving a fractional output of an exponential

Advanced Math practice question

The function f is defined by f(x) = 2ˣ. For what value of x is f(x) = 1/8?

Answer: -3

1/8 = 2⁻³, so x = −3.

Common wrong answers

If you answered 3
3 gives 2³ = 8, not 1/8.
If you answered -8
−8 confuses the output with the exponent.
If you answered 0.125
0.125 is the output, not x.

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