What are the solutions of $4x^2 - 9 = 0$?

Explanation

1. 01

   $4x^2 = 9$, so $x^2 = \frac{9}{4}$.

2. 02

   Taking square roots gives both signs: $x = \pm\frac{3}{2}$.

3. 03

   (Or factorise: $(2x - 3)(2x + 3) = 0$.)