Question

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Answer 1

A) x²+5x+6=0

∆= b²- 4.b.c

∆= 5²- 4.1.6

∆= 25-24

∆= 1

x= -b ± √1 / 2.a

x'= - 5+1/ 2.1= -4/2= -2

x"= -5-1/2.1= -6/2= -3

B) x²+6x+5=0

∆= b²- 4.b.c

∆= 6²-4.1.5

∆=36-20

∆=16

x= -b ± √1 / 2.a

x'=-6+4/2.1=-2/2=-1

x"=-6-4/2.1=-10/2=-5

C)x²-3x+2=0

∆= b²- 4.b.c

∆=(-3)²-4.1.2

∆=9-8

∆=1

x= -b ± √1 / 2.a

x'=3+1/1.2=-4/2=2

x"=3-1/1.2=2/2=1

D)x²-5x+6=0

∆= b²- 4.b.c

∆=(-5)²-4.1 .6

∆=25-24

∆=1

x= -b ± √1 / 2.a

x'=5+1/2.1=6/2=3

x"=5-1/2.1=4/2=2