Is that an axe? +bx=-c
2. Convert the quadratic coefficient into 1.
x? +bx/a=-c/a
3. Add the square of half of a coefficient to both sides at the same time.
x? +bx/a+b? /4a? =b? /4a? -c/a
The writing on the right is completely flat.
(x+b/2a)? =(b? -4ac)/4a?