25x²=81

To solve the equation \( 25x^2 = 81 \), follow these steps:

1. Divide both sides by 25:

   \[ x^2 = \frac{81}{25} \]

2. Take the square root of both sides:

   \[ x = \pm \sqrt{\frac{81}{25}} \]

3. Simplify the square root:

   \[ x = \pm \frac{\sqrt{81}}{\sqrt{25}} = \pm \frac{9}{5} \]

So the solutions are:

\[ x = \frac{9}{5} \quad \text{and} \quad x = -\frac{9}{5} \]