Question

Cum pot sa descompun: 2xpatrat-x-3 ?

Answer 1

 2x²-x-3=2x²+2x-3x-3=2x(x+1)-3(x+1)=(x+1)(2x-3)

Answer 2

[tex]Trebuie~sa~folosesti~un~artificiu~de~calcul. \\ 2x^2-x-3 \\ Cauti~ doua~numere~care~inmultite~sa~dea~-6(produsul~dintre \\ 2~si~-3)~iar~adunate~sa~dea~-1(de~la~-1x). \\ a*b=-6 \\ a+b=-1 \\ Numerele~sunt~-3~si~+2. \\ 2x^2-3x+2x-3= \\ Dam~factor~comun: \\ 2x(x+1)-3(x+1)= \\ =(x+1)(2x-3) [/tex]