Which expression is equivalent to [tex]\left(\frac{1}{z^{3 / 5}}\right)^{-1 / 5}[/tex]?

A. [tex]z^{3 / 25}[/tex]

B. [tex]z^{-3 / 25}[/tex]

C. [tex]z^{-2 / 5}[/tex]

D. [tex]z^{2 / 5}[/tex]



Answer :

To determine which expression is equivalent to [tex]\(\left(\frac{1}{z^{3/5}}\right)^{-1/5}\)[/tex], we need to simplify it step-by-step.

1. Let's start by rewriting the initial expression:
[tex]\[ \left(\frac{1}{z^{3/5}}\right)^{-1/5} \][/tex]

2. Recall that [tex]\(\frac{1}{z^{3/5}}\)[/tex] can be rewritten as [tex]\(z^{-3/5}\)[/tex]. So the expression becomes:
[tex]\[ \left(z^{-3/5}\right)^{-1/5} \][/tex]

3. Next, apply the exponent rule [tex]\((a^m)^n = a^{m \cdot n}\)[/tex]. Here, [tex]\(a = z\)[/tex], [tex]\(m = -3/5\)[/tex], and [tex]\(n = -1/5\)[/tex].
[tex]\[ \left(z^{-3/5}\right)^{-1/5} = z^{(-3/5) \cdot (-1/5)} \][/tex]

4. Now, we need to multiply the exponents [tex]\(-3/5\)[/tex] and [tex]\(-1/5\)[/tex]:
[tex]\[ (-3/5) \times (-1/5) = 3/25 \][/tex]

5. Therefore, the expression simplifies to:
[tex]\[ z^{3/25} \][/tex]

So, the expression equivalent to [tex]\(\left(\frac{1}{z^{3/5}}\right)^{-1/5}\)[/tex] is:

[tex]\[ \boxed{z^{3/25}} \][/tex]

Thus, the correct answer is:

A. [tex]\(z^{3/25}\)[/tex]