Question

Daca $\frac{x}{√3-1}$ =$\frac{√3+1}{y}$ calculati 2-xy

Answer 1

Produsul mezilor=produsul extremilor.
xy=(3a-1)(3a+1)
xy=9$a^{2}$-1
Deci 2-xy=2-$( 9a^{2} -1)$=3-$9a^{2}$=3(1-3$a^{2}$)