Răspuns :
Din relatiile lui Viete stim ca o ecuatie de gradul al doilea de forma
[tex]x^{2}-S*x+P=0[/tex] are urmatoarele relatii
[tex]x1+x2=S[/tex]
[tex]x1*x2=P[/tex]
Asadar, doar le aplicam acum
a) S=7+(-7)=0
P=(7)*(-7)=-49
deci ecuatia este: [tex]x^{2}-49[/tex]
b) [tex]S=\frac{1}{2}+\frac{5}{7}=\frac{7+10}{14}=\frac{17}{14}[/tex]
[tex]P=\frac{1}{2}*\frac{5}{7}=\frac{5}{14}[/tex]
deci ecuatia este: [tex]x^{2}-\frac{17}{14}*x+\frac{5}{14}[/tex]
[tex]x^{2}-S*x+P=0[/tex] are urmatoarele relatii
[tex]x1+x2=S[/tex]
[tex]x1*x2=P[/tex]
Asadar, doar le aplicam acum
a) S=7+(-7)=0
P=(7)*(-7)=-49
deci ecuatia este: [tex]x^{2}-49[/tex]
b) [tex]S=\frac{1}{2}+\frac{5}{7}=\frac{7+10}{14}=\frac{17}{14}[/tex]
[tex]P=\frac{1}{2}*\frac{5}{7}=\frac{5}{14}[/tex]
deci ecuatia este: [tex]x^{2}-\frac{17}{14}*x+\frac{5}{14}[/tex]
x₁+x₂=S
x₁x₂=P
Ecuatia va arata asa x²-Sx+P=0
a)S=0
P=-49
=>x²-49=0
b)S=1/2+5/7=(7+10)/14=17/14
P=5/14
=>x²-17/14x+5/14=0
x₁x₂=P
Ecuatia va arata asa x²-Sx+P=0
a)S=0
P=-49
=>x²-49=0
b)S=1/2+5/7=(7+10)/14=17/14
P=5/14
=>x²-17/14x+5/14=0