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Catalinasmille
a fost răspuns

Aflati DVA al ecuatiei:
[tex]a) \frac{2-x}{x}=3[/tex]
b)[tex] x^{2} -1=0[/tex]
c)[tex] \sqrt{x} +2=6[/tex]
d)[tex]3x+5=x+1[/tex]

Răspuns :

a) 2-x=3x
-x-3x=-2
-4x=-2       ·(-1)
x=2/4
x=1/2

b) (x²-1)=0
(x+1)(x-1)=0
x+1=0
x₁=-1
x-1=0
x₂=1
x∈{-1,1}

c)√x=6-2
√x=4
(√x)²=4²
x=16

d)3x-x=1-5
2x=-4
x=-4/2
x=-2

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