Question

1)Rezolvați ecuatiile:
a)-2y +1 =0 €R
b)0=3x - 1 supra 2
c)1, 2x +1, 2 =0
d)-x + 7 radical din 3 =0
e)xradical2 +1 =0
f) (2-radical3)x +radical -2=0
2)Pentru ce valori ale lui a €R ecuația necunoscută x €R, ax+3=0 are solutia -3?

Answer 1

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Answer 2

a)-2y=-1⇒y=1/2∈R
b)0=(3x-1)/2⇒3x-1=0⇒3x=1⇒x=1/3
c)1,2x+1,2=0⇒1,2x=-1,2⇒x=-1
d)-x+7√3=0⇒-x=-7√3⇒x=7√3
e)x√2+1=0⇒x√2=-1⇒x=-√2
f)(2-√3)x+√3-2=0⇒(2-√3)x=-√3+2⇒x=1
2)ax+3=0  x=-3 ⇒-3a+3=0 ⇒-3a=-3⇒a=1⇒ Atunci cand a=1∈R ecuatia are solutia -3