It could be solved easier by factoring like this:





 or 

 or  or 

But you are told specifically to do it by the
quadratic formula.  So this is what we do
there:

The solution to

 is



You must memorize that!

In your problem



, , 

So substituting:











That's two solutions

1.   

2.   

So you see we get the same solutions as we did 
when we factored it.

Edwin