Question

if | 3i+2j+ak|=5, then a=​

Answer 1

Answer:

Just as a note, you mean the value of “a”, not the value of “A.” A is given as a fixed vector.

Vectors that are perpendicular to one another have zero inner product:

A . B = 5*2 + 7*2 + 3*a = 0

Note that the last operator is + because both vectors have negative k components; the product of two negatives is a positive.

This is easy to solve:

10 + 14 + 3a = 0

3a = -24

a = -8.

Answer 2

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