Question

1) Resolva as equaçoes incompletas do 2 grau sendo U=R
a)5x^2-3125=0
b)9x^2-3x=0
c)x^2-81=0
d)2x^2+6x=0
e)-6x^2+6x=0

Answer 1

Resposta:

a) x^2- 625

x^2=625

x=+-25

x=-25

x=25

x1=-25, x2=25

b) 3x.(3x-1)=0

x.(3x-1)=0

x=0

3x-1=0

x=1/3

x1=0, x2= 1/3

c) x^2=81

x=+-9

x=-9

x=9

x1=-9, x2=9

d) 2x.(x+3)=0

x.(x+3)=0

x=0

x+3=0

x=-3

x1=-3, x2=0

e) -6x.(x-1)=0

x.(x-1)=0

x=0

x-1=0

x1=0

x2=1