Question

socorro urgente 3x²+18x-15=0

Answer 1

Resposta:

9x+18x-15=27x-15=12x

Answer 2

Fórmula de Delta: $b^2-4ac$

Fórmula de Bhaskara: $\frac{-b\pm\sqrt\Delta}{2a}$

Resposta: $3x^2+18x-15=0$ ; a= 3 | b=18 | c=-15

$\Delta=18^2-4.3.(-15)\\\Delta=324-4.(-45)\\\Delta=324+180\\\Delta=504\\\\\sqrt504=22$

$x=\frac{-18\pm\sqrt504}{2.3}\\x=\frac{-18\pm22}{6}\\\\x'=\frac{4}{6}=0,\overline{6}\qquad x''=\frac{-40}{6}=-6,6$