Question

Rezolvati
(x-1)(x+2)=0

Answer 1

x la puterea a doua +2x-x-2=0 ; x la puterea a doua+x-2=0 ;(a=x la puterea a doua, b=x si c=-2) ; d=b la puterea a doua -4*a*c ; d= 1-4*1*(-2)= 9 ; x1/2 = (-b +/- √d):2 ;