Question

rezolvati ecuatia in multimea R
$\sqrt{3x} + 2 = 8$
si in multimea Q

Answer 1

 

$\displaystyle\\\sqrt{3x} +2=8\\\\\sqrt{3x}= 8-2\\\\\sqrt{3x}=6~~~\text{ Ridicam la puterea a 2-a}\\\\\Big(\sqrt{3x}\Big)^2=\Big(6\Big)^2\\\\3x=36\\\\x=\frac{36}{3} \\\\\boxed{\bf x=12}$