dik. vektor r1=4i + 2j r2= -3i + 4j Tntukan a= Ir1+r2I b+ Ir1 +r2I

[tex]
\text{diketahui: }\\
\vec{r_1}=4\hat{i}+2\hat{j}\\
\vec{r_2}=-3\hat{i}+4\hat{j}\\
\text{selanjutnya, }\\
|\vec{r_1}+\vec{r_2}|=|4\hat{i}+2\hat{j}+(-3\hat{i})+4\hat{j}|=|\hat{i}+6\hat{j}|=\sqrt{1^2+6^2}=\sqrt{1+36}=\sqrt{37}
[/tex]