Question

Cine stie sa le facă??????

Answer 1

Răspuns:

1. a) Δ= $b^{2}$-4ac= 64 - 4*1*6= 64-24= 40

x1=(-b-$\sqrt{D}$)/2a = (8-2$\sqrt{10}$)/2 =4-$\sqrt{10}$

x2=8+2$\sqrt{10}$/2= 4+$\sqrt{10}$

b) S= x1+x2= 4-$\sqrt{10}$ +4 -$\sqrt{10}$ = 8

P=x1*x2= (4-$\sqrt{10}$ )*(4+$\sqrt{10}$ )= 16-4$\sqrt{10}$ + 4$\sqrt{10}$  -10= 16-10= 6

P=6 S= 8

3) Δ=$b^{2}$-4ac= 25-4*1*6= 25-24=1  

x1= (-b-$\sqrt{D}$)/2a= 5-1/2= 4/2= 2  

x2= 5+1/2= 6/2= 3