How would you solve 3x^2-12=0?

3x^2 - 12 = 0

Personally, I would divide each side by 3 x^2 - 4 = 0

Then I would add 4 to each side x^2 = 4

Then I would take the square root of each side: x = + 4

x = - 4.

Having found both solutions, I would relax with a cup of tea.