Răspuns:
[tex]$\mathbf{ S =\left\{ - 4 ;3 \right\} }$[/tex]
Explicație pas cu pas:
[tex]$\mathbf{196 - (4x + 2) {}^{2} = 0 }$[/tex]
[tex]$\mathbf{ - (4x + 2) {}^{2} = - 196 }$[/tex]
[tex]$\mathbf{(4x + 2) {}^{2} = 196}$[/tex]
[tex]$\mathbf{4x + 2 = \pm14}$[/tex]
[tex]$\mathbf{4 x + 2 = - 14 \: \Longrightarrow \: x = - 4}$[/tex]
[tex]$\mathbf{4x + 2 = 14 \Longrightarrow \: x = 3}$[/tex]
[tex]\boxed{\mathbf{ S =\left\{ - 4 ;3 \right\}}}[/tex]
Bafta ! :)
