Question

Cum descompun 2x la a doua -x-3 ? ajutor

Answer 1

$\rm 2x^2-x-3= \\ \\ Folosesti~artificiul~de~calcul:cauti~doua~numere~care~inmultite \\ dau~-6~(-3\cdot2)~si~adunate~-1~(coeficientul~lui~-x). \\ \\ 2x^2+2x-3x-3= \\ \\ Dai~factor~comun: \\ \\ 2x(x+1)-3(x+1)=\bold{(x+1)(2x-3)}$