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Determinati numerele naturale x si y daca:
a) (x+1)*(y+2)=15
b) (2x+1)*(y-12)=21




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Răspuns :

Didi12342
a) (x+1|)× (y+2) = 15
(x+1) × (y+2) = 3 × 5
x+1 =3 ==>x = 2
y+2 = 5 ==> y = 3

b) (2x+1) × (y-12) = 21 = 3 × 7
2x+1 = 3 ==> x = 1
y- 12 = 7 ==> y = 19