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

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

User Pablissimo
by
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2 Answers

4 votes

Answer:

18

Step-by-step explanation:

User Marcin Romaszewicz
by
7.5k points
6 votes
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
User Ali Reza Dehdar
by
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