a) x² = 100
x = ± 10
b) y² = 4/9
y = ± 2/3
c) x² = - 64 nu are solutie
d) 2x² = 8
x² = 4
x = ± 2
e) 4z²/5 = 45
4z² = 225
z² = 225/4
z = ± 15/2
f) 0,5t² = 24,5
t² = 49
t = 7
