Question

[7] A =i+2j-k & B =i+j-2k Find Cross
product & dot product of vector A & vector B.​

Answer 1

Answer:

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Answer 2

Explanation:

Notice that the dot product of two vectors is a number and not a vector. For 3 dimensional vectors, we define the dot product similarly:

Dot Product in R3

If

v = ai + bj + ck and w = di + ej + fk

then

v . w = ad + be + cf

Examples:

If

v = 2i + 4j

and

w = i + 5j

then

v . w = (2)(1) + (4)(5) = 22

Exercise

Find the dot product of