Question

B= { xєZ | (2x+√3)(2-x√3)=1 }
Scrieti elementele multimii B .

Answer 1

$4x-2 \sqrt{3} x^{2} +2 \sqrt{3} -3x=1 \\ 2 \sqrt{3}( x^{2} -1)=x-1 \in Z=\ \textgreater \ x^{2} -1=0\ si \ x-1=0$
rezulta x=1, B={1}