Respuesta :

NoJoke
This is basically proving the quadratic formula. B is the correct answer.

Here is what I did after step 5:

x²+bx/a+b²/4a² = b²/4a²  -  4ac/4a²

(x + b/2a )²  =  b²-4ac/4a²  (The answer)

√(x+b/2a)²  =  + or -  √b²-4ac/4a²

x+b/2a  =  + or - √b²-4ac/2a

x = -b/2a + or - √b²-4ac/2a

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