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Se considera functia f:r-->r ; f(x)=x patrat -2x+4.sa se determine valorile nr real m pentru care punctul a(m,4) apartine graficului functiei f
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Răspuns :

[tex] A(m; 4) \ apartine \ Gf \Rightarrow f(m) = 4 \\ \\ f(m) = 4 \Rightarrow m^{2}-2m+4=4 \Rightarrow m^{2}-2m=0 \\ \\ \Delta=(-2)^{2}-4*1*0=4>0 \\ \\ m_1= \frac{-(-2)- \sqrt{ \Delta}}{2*1} = \frac{2 - 2}{2} = 0 \\ \\ m_2= \frac{-(-2) + \sqrt{ \Delta}}{2*1} = \frac{2+2}{2} = 2 [/tex]
[tex]f(x) = x^2-2x+4[/tex]

[tex]A(m,4) \in G_f \Rightarrow f(m) = 4 \Rightarrow m^2-2m +4 = 4 \Rightarrow \\ \\ \Rightarrow m^2-2m = 0 \Rightarrow m(m-2) = 0 \\ \\ m= 0 \quad $sau$ \quad m-2 = 0 \Rightarrow m =2\\ \\ \Rightarrow \boxed{m \in \Big\{0;2\Big\}}[/tex]