Question

ajutati mAaaa ex 3..​

Answer 1

Explicație pas cu pas:

a)

$2x + 1 = \sqrt{2} \\ 2x = \sqrt{2} - 1 \\ x = \frac{ \sqrt{2} - 1}{2}$

$A = \Big\{\frac{ \sqrt{2} - 1}{2} \Big\}$

b)

${x}^{2} = 5 \: x = \pm \sqrt{5} \not \in \mathbb{Q}$

B = Ø

c)

${x}^{2} \leqslant 0 \implies x = 0$

$C = \Big\{0\Big\}$

d)

$|x| = 3 \implies x = \pm 3$

$D = \Big\{ - 3; 3\Big\}$