Question

Se considera expresia E(x)=(x+2) la puterea a doua - 1  supra  x patrat  + 4 : x supra x patrat + 4. Aratati  ca E(x)=4.

Answer 1

$\frac{ x^{2}+4x+4- x^{2} -4 }{ x^{2} +4} : \frac{x}{x^{2} +4} = \frac{4x}{x^{2} +4}* \frac{x^{2} +4}{x}= \frac{4x}{x}=4$