Bonsoir,
(2x+7 (3x-12)=0
2x + 7 = 0 ou 3x - 12 = 0
2x = - 7 3x = 12
x = - 7/2 x = 12/3
x = - 3,5 x = 4
(5y-2)(6y+9) = 0
5y - 2 = 0 ou 6y + 9 = 0
5y = 2 6y = - 9
y = 2/5 y = - 9/6
y = - 3/2
Pour la 1ere :
(2x+7)(3x-12)=0
6x²-24x+21x-84=0
6x²-3x-84=0
delta=(-3)²-4*(6*-84)
delta=9+2016=2025
x1=(-(-3)+racine(2025))/(2*6)
x1=4
x2=(-(-3)-racine(2025))/(2*6)
x2=-3.5
(5y-2)(6y+9)=0
30y²+45y-12y-18=0
30y²+33y-18=0
delta=33²-4*(30*-18)
=1089+2160
=3249
x1=(-45+racine(3249))/(2*30)
x1=0.2
x2=(-45-racine(3249))/(2*30)
x2=-1.7
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Verified answer
Bonsoir,
(2x+7 (3x-12)=0
2x + 7 = 0 ou 3x - 12 = 0
2x = - 7 3x = 12
x = - 7/2 x = 12/3
x = - 3,5 x = 4
(5y-2)(6y+9) = 0
5y - 2 = 0 ou 6y + 9 = 0
5y = 2 6y = - 9
y = 2/5 y = - 9/6
y = - 3/2
Pour la 1ere :
(2x+7)(3x-12)=0
6x²-24x+21x-84=0
6x²-3x-84=0
delta=(-3)²-4*(6*-84)
delta=9+2016=2025
x1=(-(-3)+racine(2025))/(2*6)
x1=4
x2=(-(-3)-racine(2025))/(2*6)
x2=-3.5
(5y-2)(6y+9)=0
30y²+45y-12y-18=0
30y²+33y-18=0
delta=33²-4*(30*-18)
=1089+2160
=3249
x1=(-45+racine(3249))/(2*30)
x1=0.2
x2=(-45-racine(3249))/(2*30)
x2=-1.7