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Buna.
Am nevoie de ajutor.
''Determinati numerele naturale x si y stiind ca x la puterea a doua inmultit cu (y+3)=864 ''
Multumesc.


Răspuns :

^=putere
*=ori
+=plus
x^2*(y+3)=864
il descompunem pe 864(nu in factori primi).
864=12^2*6⇔X^2*(y+3)
x^2=12^2
x=144
x=√144
x=12
y+3=6
y=6-3
y=3
verificare:
12^2*(3+3)=144*6=864
x²(y+3)=864
864=2⁵ * 3³
x²={2²,2⁴,3²,2²*3²,2⁴*3²}   ⇒ x={-12,-6,-4,-3,-2,2,3,4,6,12}
y={3,21,29,51,213}

y+3=2³ * 3³ 
y+3=8*27
y=213

y+3=2 * 3³ 
y+3=2*27
y=51

y+3=2⁵
y+3=32
y=29

y+3=2³ *3
y+3=24
y=21

y+3=2*3
y+3=6
y=3