Question

Se x2 +
y2 = 13 e x . y = 6, então o valor de (x
+ y)2 é ?

Answer 1

$(x+y)^2=\\\\(x)^2+2\cdot(x)\cdot(y)+(y)^2=\\\\x^2+2xy+y^2=\\\\\underbrace{x^2+y^2}_{13}+2\cdot\underbrace{xy}_{6}=\\\\13+2\cdot6=\\\\13+12=\\\\\boxed{25}$

Answer 2

Resposta:

25

Explicação passo a passo: