Question

Fie A={x∈ Z║x+2|≤9}.Enumerand elementele acestei multimi ,vei obtine un numar de .......... elemente.
Raspuns corect 18 vreau rezolvarea

Answer 1

A={x∈ Z| |x+2|≤9}
|x+2|≤9
-9≤x+2≤9 |-2
-11≤x≤7
x∈Z
=> x∈{-11,-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7}