Question

3. If the vector A = 5 î + 7j -3k and B = 2 î +2j-ch
are mutually perpendicular, then the value of cis.
(a) 2
(b) 6
(c)-8
(d)-7​

Answer 1

Answer:

cos 90 =0

so dit product is 0

so

10+14+3c=0

so c is -8

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Answer 2

Answer:

See answer in above picture

Explanation:

Answer is - 8