Răspuns:
Nu se vede prea bine... sper ca am inteles ce scrie:
1) [tex]x^2=144[/tex] => [tex]x_{1,2}=\pm \sqrt{144}=\pm 12[/tex], adica [tex]x_1=12,x_2=-12[/tex].
2)[tex]3x^2=300[/tex] => [tex]x^2=300:3=200[/tex] => [tex]x_{1,2}=\pm \sqrt{100}=\pm 10[/tex]
3)[tex]10x^2=490[/tex] => [tex]x^2=490:10=49[/tex] => [tex]x_{1,2}=\pm \sqrt{49}=\pm 7[/tex].
4)[tex]4x^2=64[/tex] => [tex]x^2=64:4=16[/tex] => [tex]x_{1,2}=\pm 4[/tex].
5)[tex]4x^2-2=0[/tex] => [tex]4x^2=2[/tex] => [tex]x^2=\frac{2}{4}[/tex] => [tex]x_{1,2}=\pm \frac{\sqrt 2}{2}[/tex].
6)[tex]x(x+1)=x+2[/tex] => [tex]x^2+x=x+2[/tex] => [tex]x^2+x-x=2[/tex] => [tex]x^2=2[/tex] => [tex]x_{1,2}=\pm\sqrt{2}[/tex].
Nu inteleg ce scrie la celelalte ex.
