Make a simple equation in blogger

The first: we add a script:

So, we can write something math equation like:

       
When $$a \ne 0$$, there are two solutions to \(ax^2 + bx + c = 0\) and they are $$x ={-b\pm \sqrt{b^2-4ac} \over 2a}.$$.
            

Some format like coding in Latex. And the result as below:

When $$a \ne 0$$, there are two solutions to \(ax^2 + bx + c = 0\) and they are $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$