Question

Determinati multimea A={ x € N* | (2x+1) | 27 }

Answer 1

$(2x+1) | 27$ ⇒ $2x+1$∈$D_{27}=${$1,3,9,27$}. $Deci,~calculand ~ obtinem:$
$2x~$∈{$0,2,8,26$}, $de~unde~x~$ ∈{$0,1,4,13$}. $Deci$, $\underline{A=\{1,4,13\}}$. $0~ nu~ convine,$ $x \in \mathbb{N}$*

Answer 2

[tex]A=\{x \in N^{*};2x+1|27\} \\ 2x+1 \in \{1,3,9,27\}|-1 \\ 2x \in \{0,2,8,26\}|:2 \\ \underline{A = \{1,4,13\}}[/tex]