If you expand the square, you have

Simplify the right hand side:

Cancel the -3x appearing on both sides:

Multiply both sides by 4:

Consider the square root of both terms (using the doubles sign):

Is it together or different questions to the reading
I don't know about the first one but for the second one:

F* you B*!!!!!! Your so S*! That's the easiest thing in the world!!