Răspuns :

[tex]\displaystyle C(x_C;y_C)\\ \overrightarrow{AC}=2\overrightarrow{AB}\\ (x_c-1)\overrightarrow{i}+(y_c-3)\overrightarrow{j}=2[(2-1)\overrightarrow{i}+(5-3)\overrightarrow{j}]\\ (x_c-1)\overrightarrow{i}+(y_c-3)\overrightarrow{j}=2\overrightarrow{i}+4\overrightarrow{j}\\ x_c-1=2=>x_c=3\\ y_c-3=4=>y_c=7\\ C(3;7) [/tex]

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