Question

Aflati DVA al ecuatiei:
a)x/x2-1=2
b)√x+1=3
c)2/x2+4=1
d)4/ |x|=1

Answer 1

a. x²-1≠0, (x-1)(x+1)≠0, x∈R/{-1, 1}
b. x+1≥0, x≥-1, x∈[-1, +∞)
c. x²+4≠0, x∈R
d. IxI≠0, x∈R-{0}