Question

1. 81n² - 16 = 0

Explanation:

Step1: Isolate the squared term

$81n^2 = 16$

Step2: Solve for $n^2$

$n^2 = \frac{16}{81}$

Step3: Take square root of both sides

$n = \pm\sqrt{\frac{16}{81}} = \pm\frac{4}{9}$

Answer:

$n = \frac{4}{9}$ or $n = -\frac{4}{9}$