Determinați soluțiile reale ale ecuațiilor.
a)x²=36
b)ײ=3,24
c)x²=25/4
d)x²= -9
e)x²+7=907
f)4×x²+1=9²
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a) x²= 36
x= √36
x=6
b) x²=324
x= √324
x=18
c) x²=25/4
x= √25/4
x=5/2= 2,5
d) x²=-9 => x NU aparține soluțiilor reale
e) x²+7=907
x²=900
x= √900
x=30
f) 4x²+1=9²
4x²+1=81
4x²=80
x²=20
x= √20
x1=2√5
x2= -2√5
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