Question

si :a+b= la raiz de 5 ; ab=3 ;calcular :a elevado ala 2 + b elevado ala 2

Answer 1

a+b=√5
ab=3

(a+b)² =  a² +b²+ 2ab

( √5 )²=a²+b²+2(3)

5=a²+b²+6

a²+b²=5-6=-1

rpta.=   -1