Question

ma poate ajuta cineva la 2?​

Answer 1

Intai calculezi solutiile ecuatiei:

x²-7x+12=0

∆=b²-4ac

∆=(-7)² - 4×1×12

∆=49-48 =1

x1,x2=(-b±√∆)/2a

x1= (7+1)/2 =4

x2= (7-1)/2 =3

Acum inlocuiesti in egalitate

2(x1+x2) -x1×x2=

2(4+3)-4×3=

14-12=2