Răspuns:
Salut
a)√x=3√7
x=9•7
x=63
√63=3√7
x=63.
b)√x²=4
|x|=4
x=4
x=-4
x1=-4;x2=4.
c)x²=27
x=3√3
x=-3√3
x1=-3√3; x2=3√3.
d)(2x+1)²=25
2x+1=±5
2x+1=5
2x+1=-5
x=2
x=-3
x1=-3; x2=2.
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