Question

VA rog
Se considera expresia:  E(x)=2supra x²-9 +1supra x-3
a) Calculati E(x)
b) Sa se aduca E(x) la forma cea mai simpla

Answer 1

$\frac{2}{(x-3)(x+3)} + \frac{1}{x-3} = \frac{2}{(x+3)(x-3)} + \frac{x+3}{(x-3)(x-3)} = \frac{2+x+3}{(x+3)(x-3)} = \frac{x+5}{(x+3)(x-3)}$