Select all of the expressions that are equivalent to (2/3)^−4

Responses

2×−43×−4
the fraction with numerator 2 times negative 4 and denominator 3 times negative 4

(−23)4
open paren negative 2 thirds close paren to the 4th power

(32)4
3 halves to the 4th power

812
8 over 12

−2×2×2×23×3×3×3
negative the fraction with numerator 2 times 2 times 2 times 2 and denominator 3 times 3 times 3 times 3

−1681
negative 16 over 81

8116
81 over 16

3×3×3×32×2×2×2

1 answer

To determine which expressions are equivalent to \((\frac{2}{3})^{-4}\), we can manipulate the original expression step by step.

  1. Applying the negative exponent rule: \[ (a/b)^{-n} = (b/a)^{n} \] So, \[ (\frac{2}{3})^{-4} = (\frac{3}{2})^{4} \]

  2. Calculating \((\frac{3}{2})^{4}\): \[ (\frac{3}{2})^{4} = \frac{3^{4}}{2^{4}} = \frac{81}{16} \]

Thus, we need to check which of the provided responses are equal to \(\frac{81}{16}\).

Checking the responses:

  1. \(2^{-4} \times 3^{-4}\): \[ = \frac{1}{2^4} \cdot \frac{1}{3^4} = \frac{1}{16} \cdot \frac{1}{81} = \frac{1}{1296} \quad \text{(not equivalent)} \]

  2. The fraction with numerator \(2 \times -4\) and denominator \(3 \times -4\): \[ = \frac{-8}{-12} = \frac{8}{12} = \frac{2}{3} \quad \text{(not equivalent)} \]

  3. \((-2/3)^{4}\): \[ = \frac{16}{81} \quad \text{(not equivalent)} \]

  4. \((\frac{3}{2})^{4}\): \[ = \frac{81}{16} \quad \text{(equivalent)} \]

  5. \(\frac{8}{12}\): \[ = \frac{2}{3} \quad \text{(not equivalent)} \]

  6. \(-\frac{16}{81}\): \[ \text{(not equivalent)} \]

  7. \(\frac{81}{16}\): \[ = \frac{81}{16} \quad \text{(equivalent)} \]

  8. \(3 \times 3 \times 3 \times 3 \times 2 \times 2 \times 2 \times 2\): \[ = \frac{81}{16} \quad \text{(equivalent)} \]

Summary of Equivalent Expressions:

  • \((\frac{3}{2})^{4}\)
  • \(\frac{81}{16}\)
  • \(3 \times 3 \times 3 \times 3 \times 2 \times 2 \times 2 \times 2\)

Therefore, the correct equivalents from the options provided are:

  • \((\frac{3}{2})^{4}\)
  • \(\frac{81}{16}\)
  • \(3 \times 3 \times 3 \times 3 \times 2 \times 2 \times 2 \times 2\)