Bonjour,
on remplace x par-2
x²+1= 5x+7
(-2)²+1 = 5(-2)+7
4+1 = -10+7
5 ≠-3 faux, -2 n'est pas solution de x²+1= 5x+7
5x-3= 10x+8
5x-10x= 8+3
-5x= 11
x= -11/5
S= { -11/5 }
2(x-3)= 3(4x-8)
2(x-3)- 3(4x-8)= 0
2x-6-12x+24= 0
-10x+18= 0
-10x= -18
x= -18/-10 on simplifie par 2
x= 9/5
S= { 9/5 }
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Bonjour,
on remplace x par-2
x²+1= 5x+7
(-2)²+1 = 5(-2)+7
4+1 = -10+7
5 ≠-3 faux, -2 n'est pas solution de x²+1= 5x+7
5x-3= 10x+8
5x-10x= 8+3
-5x= 11
x= -11/5
S= { -11/5 }
2(x-3)= 3(4x-8)
2(x-3)- 3(4x-8)= 0
2x-6-12x+24= 0
-10x+18= 0
-10x= -18
x= -18/-10 on simplifie par 2
x= 9/5
S= { 9/5 }