(a)x2 + (b)x + (c) = 0
-(b) + √(b)2 - 4.(a).(c)
2.(a)
∆ = (b)2 - 4.(a).(c)
∆ = (?) - (?)
∆ = ?
x' = ((-b) + √∆) / (2.(a))
x" = ((-b) - √∆) / (2.(a))
x' = ?
x" = ?
...
