Question

Trebuie aflat $a^{2} + b^{2}$ si se stie suma=4 si produsul=3

Answer 1

a+b=4 ridici   la   patrat
(a+b)²=4²
a²+2ab+b²=16
a²+b²=16-2*3
a²+b²=16-6=10

Answer 2

a +b  = 4 
ab = 3 
(a + b)^2 = a^2 + 2ab + b^2  = 4^2 
a^2 + b^2  = 16 - 2 x 3 = > 16 - 6 = 10