Question

calcule
(x+3).(x+4)-2.(x+1)

Answer 1

x²+4x+3x+12-2x-2
x²+5x+10

a=1   b=5   c=10

Δ= -b+4ac
Δ= -5+4.1.10
Δ=-5+40
Δ= 35

x=(b²±√Δ)/2a
x=(25±√35)/2

x1=25+√35
      --------
          2


x2=25-√35
      --------
          2