Question

AFLATI ELEMENTELE MULTIMILOR :
A={X∈Z | |x|=5}
B={X∈R | |$x^{2}$ |=18}

Answer 1

   
[tex]A = \{-5;~5\} \\ \\ B= \{- \sqrt{18} ;~\sqrt{18}\}= \{- 3\sqrt{2} ;~3\sqrt{2}\}[/tex]