Question

equação do segundo grau
3d² + 18d - 81 = 0

Answer 1

3d² + 18d - 81 = 0. ==> :(3)

d² + 6d - 27 = 0

∆=36+108=144 => √∆=12

x = -b±√∆/2a

x = -6±12/2

x' = -6+12/2 = 6/2 = 3

x''= -6-12/2 = -18/2 = -9

Answer 2

Resposta:

S= {3; -9}

Explicação passo-a-passo:

3d²+18d-81=0

a=3 , b= 18 e c= -81

delta= b²-4ac

delta =18²-4•3•-81

delta =324+972

delta =1.296

$\sqrt{1296} = 36$

x'= (-18+36)/2.3

x'=18/6

x'=3

x"=(-18-36)/2.3

x"= -54/6

x"= -9