Example 1.

Given the two vectors


D=6i+3j-k
and
E=4i-5j+8k
find the magnitude of the vector 2D-E



solution
Let get F=2D-E ,
F=2(6i+3j-k)-(4i-5j+8k)
=(12-4)i+(6+5)j+(-2-8)k
=8i+11j-10k
Then the magnitude of F come from






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