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Given that e=8i-6j and f=4i+11j find 5f-2e Show your work.

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Very straightforward ...

if e=8i-6j and f=4i+11j
then 5f - 2e
= 5(4i + 11j) - 2(8i - 6j)
= 20i + 55j - 16i + 12j
= 4i + 67j

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