Réponse :
bonjour
résoudre
3x+3=2x+5
3x-2x=5-3
x=2
x²+3=2x+27
x²+2x=27-3
x²+2x=24
x²+2x-24=0
factoriser =(x+6)(x-4)
x+6=0 x-4=0
x=-6 x=4
3x³+2x²-2
f(-2)
(-2)³+2×(-2)²-2=-8+8-2=-2
f(-1)
(-1)³+2×(-1)²-2=-1+2-2=-1
f(0)
0³+2×0²-2=-2
f(2)
2³+2×2²-2=8+4-2=14
f(3)
3³+2×3²-2=27+18-2=43
f(5/2)
(5/2)³+2×(5/2)²-2=125/8+25/2-2=125/8+100/8-16/8=209/8
f(7/3)
(7/3)³+2×(7/3)²-2=343/27+98/9-2=343/27+294/27-54/27=583/27
Explications étape par étape :
