Question

URGENT ASTA E DE LA TEZA
Se dau mulțimile A={-1;0;1;2;3;4;5 } ,B={x∈R|x^2-5x+6=0}.
Aflați A∩B.

Answer 1

Răspuns:

x^2-5x+6=0

∆=25-4*1*6=25-24=1

X1=(-b-√∆)/(2*a)=(5-1)/(2*1)=4/2=2

X2=(-b+√∆)/(2*a)=(5+1)/(2*1)=6/2=3

B={2;3}

A∩B={2;3}