I need help getting the variable b by itself

this is what i have so far but need help finishing it. If you could show step by step instructions that'd be great.

(2a)(2a)

2ax=-b +/- sqrt(b^2-4ac)

+b +b

(2ax+b)^2= +/-sqrt( b^2-4ac)^2

(2ax+b)^2= b^2-4ac