Question

Resolva considerando U=R.
a) -7x^2=0
b) x^2=0
c)2x^2/7=0
d) -4x^2+2=2

Answer 1

-7x² = 0
x² = 0/-7 = 0 
x = vazio
b
x = 0
c
x = 0
d
4x² = 2 - 2
4x² = 0
x² = 0/4 = 0  vazio