Question

Va rog exercitiul 5 nu le stiu plz va rog dun suflet!

Answer 1

a) Ecuatia devine:
$\frac{14-1}{9} x^{2} -1= ( \frac{2}{9} )^2}$
Se aduce la acelasi numitor.
Ecuatia devine
$117x^{2} =85$[tex] x^{2} = \frac{85}{117} \\ x_{1,2=+- \sqrt{ \frac{85}{117} [/tex]
b)
$\frac{1}{10}* x^{2} + \frac{2}{100} = \frac{3}{1000}$
Se aduce la acelasi numitor
[tex] 100 x^{2} +20=3 \\ 100 x^{2} =-17 \\ x^{2} =- \frac{17}{100} \\ [/tex
x∉R
c)Ca expresia sa fie egala cu 0 atunci ecuatia 
$x^{2} -3=0 \\ \\ x^{2} =3 \\ x_{1,2}=+- \sqrt{3}$