If u = 6i + 2j and v = 3i + 10j find 2u - 6v
solution
= 2u - 6v
= 2(6i + 2j) - 6(3i + 10j)
= 12i + 4j - 18i - 60j
= (12i + 18i) + (4j - 60j)
= 30i - 56j
Hence 2u - 6v = 30i - 526j
TRY THIS..................
If u = -4i + 3j and v = 2i + 4j;
find 7u - 2v.
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