Question

Resolva essas duas equações do 2 grau incompletas

x/2 - 9 = 0 x/2 + 2x = 0

Answer 1

x²-9=0
Δ= b²-4.a.c
Δ= 0²-4.1.(-9)
Δ= 0+36
Δ= 36
x=-b+/-√Δ/2.a
x= -0+/-√36/2.1
x'= -0 +6/2
x=6/2⇒x=3
x"=-0-6/2
x"= -6/2⇒x"= -3

x²+2x=0
Δ= b²-4.a.c
Δ= 2²-4.1.0
Δ= 4-0
Δ= 4
x=-b+/-√Δ/2.a
x= -(+2) +/- √4/2.a
x'=-2+2/2
x'= 0/2⇒x'= 0
x"= -2-2/2
x"= -4/2⇒x"= -2
Espero ter ajudado!