Question

If A= -2i + j - 3k and B = 5i + 2j -k , then find ( A+B ). (A -B )

Answer 1

Answer:

32 is the answer,

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Answer 2

Answer:

A+B = -2i+j-3k + 5i+2j-k

= 3i+3j-4k

(A-B) = √3^2+3^2+(-4^2

= √9+9+16

=√34

A-B = -2i+j-3k-(5i+2j-k)

= -2i+j-3k-5i-2j+k

= -7i-j-2k

(A-B) =√(-7^2)+(-1^2)+(-2^2)

=√49+1+4

=√54