Question

NEGATIVE EXPONENTS - All of the following expressions are equal except _____.

Answer 1

Answer: Choice (3): $\frac{1}{27}$

$x^{-3}=\frac{1}{x^3}\\x=3\rightarrow x^3 = 3^3 = 27\rightarrow \frac{1}{x^3}=\frac{1}{27}$

Remember that negative power is the same as reciprocal if the same magnitude power but positive.