Resposta :
Resposta:
[tex]3x^2-300=0[/tex]
[tex]3x^2=300[/tex]
[tex]x^2 = 100[/tex]
[tex]\mathrm{Para\:}x^2=f\left(a\right)\mathrm{\:as\:solucoes\:sao\:}x=\sqrt{f\left(a\right)},\:\:-\sqrt{f\left(a\right)}[/tex]
[tex]x=\sqrt{100},\:x=-\sqrt{100}[/tex]
______________________________________________________________________________________________________________________________________________________________________________
[tex]-4x^2+100=0[/tex]
[tex]-4x^2=-100[/tex]
[tex]\frac{-4x^2}{-4}=\frac{-100}{-4}[/tex]
[tex]x=5,\:x=-5[/tex]
______________________________________________________________________________________________________________________________________________________________________________
[tex]5x^2-180=0[/tex]
[tex]5x^2=180[/tex]
[tex]x^2 = 36[/tex]
[tex]x=\sqrt{36},\:x=-\sqrt{36}[/tex]
[tex]x=6,\:x=-6[/tex]
______________________________________________________________________________________________________________________________________________________________________________
essa nao da pra fazer desse jeito krlh po.h@ búc3t4.
bhaskara entao:
[tex]7x^2-14x=0[/tex]
[tex]x_{1,\:2}=\frac{-\left(-14\right)\pm \sqrt{\left(-14\right)^2-4\cdot \:7\cdot \:0}}{2\cdot \:7}[/tex]
[tex]x_{1,\:2}=\frac{-\left(-14\right)\pm \:14}{2\cdot \:7}[/tex]
[tex]x_1=\frac{-\left(-14\right)+14}{2\cdot \:7},\:x_2=\frac{-\left(-14\right)-14}{2\cdot \:7}[/tex]
[tex]x=2,\:x=0[/tex]
______________________________________________________________________________________________________________________________________________________________________________
[tex]x_{1,\:2}=\frac{-80\pm \sqrt{80^2-4\cdot \:10\cdot \:0}}{2\cdot \:10}[/tex]
[tex]x_{1,\:2}=\frac{-80\pm \:80}{2\cdot \:10}[/tex]
[tex]x_1=\frac{-80+80}{2\cdot \:10},\:x_2=\frac{-80-80}{2\cdot \:10}[/tex]
[tex]x=0,\:x=-8[/tex]