[tex]9x^{2} -10=10\\9x^{2} -10-10=0\\9x^{2} -20=0\\Ecuatie de gradul al II-lea:\\a=9;b=0;c=-20\\Delta=b^{2}-4ac=0^{2} -4*9*(-20)=\\ = 0+720\\ =720\\Claculam solutiile ecuatiei:\\x1=\frac{{-b+\sqrt}{ Delta}}{2a} =\frac{\sqrt{720} }{18}\\ x2=\frac{{-b-\sqrt}{ Delta}}{2a} =\frac{-\sqrt{720} }{18}\\[/tex]
