r=2i−j,s=3i+5j,t=6i−2jr = 2i - j , s = 3i + 5j , t = 6i - 2jr=2i−j,s=3i+5j,t=6i−2j
2r+s−t=2(2i−j)+(3i+5j)−(6i−2j)=i+5j2r + s - t = 2(2i - j) + (3i + 5j) - (6i - 2j) = i + 5j2r+s−t=2(2i−j)+(3i+5j)−(6i−2j)=i+5j
∣2r+s−t∣=12+52=26|2r + s - t| = \sqrt{1^{2} + 5^{2}} = \sqrt{26}∣2r+s−t∣=12+52=26
