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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For x ≠ 0, which expression is equivalent to (x² + 3x) / x? - Easy–Medium
What are the solutions to the equation 2(x − 3)² − 32 = 0 ?
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