Răspuns:
m=3/2
Explicație pas cu pas:
A=1/2 * |Δ|
Arie minima, |Δ|minim
Δ=| 1 2 1 |
| 3 m 1| =
|m 1 1|
m+3+2m-m²-6-1
3m-4-m²
|-m²+3m-4| minim
|m²-3m+4| minim
pt m=-(-3)/2*1= 3/2
Extra Aria minima va fi (1/2)*f(3/2) =(1/2) *(9/4-9/2+4)=
=(1/2) *(4-9/4) =(1/2) *(7/4) =(7/8) unitati de arie
