Question

Subiectul 2 exercitiul 2 , punctul a si c

Answer 1

ex2)a)
se da legea de compozitie
x*y=xy+3x+3y+6
a)aratati ca:1*(-3)=-3
1*(-3)=1·(-3)+3*1+3(-3)+6=-3+3-9+6=-9+6=-3
c)x*x≤x
x*x=x·x+3x+3x+6≤x⇒x²+6x+6-x≤0⇒
x²+5x+6≤0
a=1
b=5
c=6
Δ=b²-4ac⇒Δ=5²-4×1×6⇒25-24⇒1⇒√Δ=√1⇒Δ=1
x1x2=-b+-√Δ/2a
x1=-5+1/2⇒-4/2⇒x1=-2
x2=-5-1/2⇒-6/2⇒x2=-3
x∈R
solutiile inecuatieisunt [-3.-2]
sucees

Answer 2

Rezolvare o gasesti in poza