Question

Determine as raízes reais das equações incompletas
A)5x²+x=0
B)-x²-9x=0
C)x²-9=0
D)25x²-1=0
E)x²-64=0
F)x²+16=0
G)-7x²+28=0
H)(x-7)(x-3)+10x=30
I)2x(x+1)=x(x+5)+3(12-x)

Answer 1

e) x² = 64
    x = √64
    x = ± 8
    x´= 8 x´´= - 8