Răspuns:
a)
x^2 = 36
x = √36
x = ± 6
b)
x^2 = -5;
x= nu are soluții reale
c)
x^2 = 0;
x = 0
d)
x^2 = 8;
x = √8
x = ± 2√2
e)
x^2 = 162;
x = ± √162
f)
x^2 - 5 = 90;
x^2 = 90 + 5
x^2 = 95
x = ±√95
g)
- x^2 = - 18 ;
x = nu are solutii reale
j)
5x^2 = 250;
x^2 = 250 : 5
x^2 = 50
x = ± √50
x = ± 5√2
k)
– 3x^2 = -1029;
x^2 = -1029 : (-3)
x^2 = 343
x = ±√343
l)
4x^2 - 13 = 203
4x^2 = 203 + 13
4x^2 = 216
x^2 = 216 : 4
x ^2 = 54
x = ±√54
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