Bonjour,
1)
E= 4x²-12x+9 - (8x²-22x+15)
E= 4x²-12x+9-8x²+22x-15
E= -4x²-10x-6
2)
E= (2x-3)(2x-3-4x+5)
E= (2x-3)(-x+2)
3)
E= -4x²-10x-6
E(√5)= -4(√5)²-10√5-6
E(√5)= -26-10√5
4)
E(1+√2)= -4(1+√2)²-10(1+√2)-6
E(1+√2)= -4( 3+2√2) -10-10√2+60
E(1+√2)= -12-8√2+50-10√2
E(1+√2)= tu réduis
5)
-4x²-10x-6=5
-4x²-10x-6-5=0
-4x²-10x-11=0
Δ = b² 4ac = (-10²- 4(-4)(-11) = -76 donc < 0
alor -4x²10x- 11 = 0 ne possède pas de solution.
