Salut
5x²+18x+2=0
Δ=18²-4(5)(2)
Δ=324-40
Δ=284
donc factorisable a(x-x1)(x-x2)
4x²+12x+9=0
Δ=12²-4(4)(9)
Δ=144-144
Δ=0 donc factorisable a(x-x0)
4x²- 3x + 11 =5x + 7
4x²-3x-5x+11-7=0
4x²-8x+4=0
Δ=64-64
Δ=0
DONC factorisable
x²-3x+10=2x+5
x²-5x+5=0
Δ=(-5)²-4(1)(5)
Δ=25-20
Δ=5 donc factorisable