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Clara20
@Clara20
May 2019
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Bonsoir tt le monde.. Pouvez vous m'aider SVP je suis bloquée dans la question 2
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Verified answer
Bonjour;
a+b = 2
ab =-3
a = 2-b
(2-b)b= -3
2b-b²+3 =0
-b²+2b+3 =0
b²-4ac = 2²-4(-1*3) = 4+12 = 16
Δ>0 2solutions
(-b-√Δ)/2a = (-2-4)/-2 = 3
(-b+√Δ)/2a = (-2+4)/-2 = -1
a = 3
b =-1
a+b = 2
3-1 =0
ab = -3
3*-1 = -3
1 votes
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Verified answer
Bonjour;a+b = 2
ab =-3
a = 2-b
(2-b)b= -3
2b-b²+3 =0
-b²+2b+3 =0
b²-4ac = 2²-4(-1*3) = 4+12 = 16
Δ>0 2solutions
(-b-√Δ)/2a = (-2-4)/-2 = 3
(-b+√Δ)/2a = (-2+4)/-2 = -1
a = 3
b =-1
a+b = 2
3-1 =0
ab = -3
3*-1 = -3