g)
[tex]\it 9x^2-4=0 \Rightarrow 9x^2=4 \Rightarrow x^2=\dfrac{4}{9} \Rightarrow \sqrt{x^2}=\sqrt{\dfrac{4}{9}} \Rightarrow |x|=\dfrac{2}{3} \Rightarrow x=\pm\dfrac{2}{3}[/tex]
h)
[tex]\it \underbrace{7x^2+10}_{>0}=0 \Rightarrow ecua\c{\it t}ia\ nu\ admite\ solu\c{\it t}ii\ reale[/tex]
