Question

$3 { \times }^{2} - 27 = 0$
qual é o cálculo


preciso pra amanhã gente​

Answer 1

Resposta:

$x=\pm3$

Explicação passo a passo:

$3x^{2} -27=0$

$3x^{2} =27$

$x^{2} =\frac{27}{3}$

$x^{2} =9$

$x =\pm\sqrt{9}$

$x =\pm\sqrt{3^{2} }$

$x =\pm3$

$OU$

$3x^{2} -27=0$

$3x^{2} -3^{3} =0$

$3x^{2} -3(3)^{2} =0$

$3x^{2} =3(3)^{2}$

$x^{2} =3^{2}$

$x =\pm\sqrt{3^{2}}$

$x =\pm3$

$OU$

$3x^{2} -27=0$

$Para:$ $ax^{2} +bx+c=0$

$Formula$ $de$ $Bhaskara:$

$x=\frac{-b\pm\sqrt{b^{2} -4ac} }{2a}$

$x=\frac{-0\pm\sqrt{0^{2} -4\times 3 \times (-27)} }{2\times 3}$

$x=\frac{\pm\sqrt{ -4\times 3 \times (-27)} }{6}$

$x=\pm\frac{\sqrt{ -12 \times (-27)} }{6}$

$x=\pm\frac{\sqrt{ 324} }{6}$

$x=\pm\frac{\sqrt{ 18^{2} } }{6}$

$x=\pm\frac{18}{6}$

$x=\pm3$