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arline1 arline1
  • 06-06-2016
  • Physics
Answered

what is the dot product of a= -2i - 5j and b=i -4j

Verified Answer :

padawan
padawan padawan
  • 07-06-2016

i.i = j.j = 1
i.j = j.i = 0

(-2i - 5j)(i -4j)
= (-2i).i + (-2i).(-4j) + (-5j).i + (-5j).(-4j)
= -2 + 0 + 0 + 20 = 18

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Nabillassm Nabillassm
  • 20-10-2021

Answer:

18

Explanation:

Answer Link

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