Question

If ˆ ˆ ˆ A i j k    3 4 5 , then the magnitude of A is​

Answer 1

Step-by-step explanation:

given, a vector 2\hat{i}+3\hat{j}+8\hat{k} is perpendicular to vector 4\hat{j}-4\hat{i}+a\hat{k} or, -4\hat{i}+4\hat{j}+a\hat{k}.

so, 2 × (-4) + 3 × 4 + 8 × a = 0

or, -8 + 12 + 8a = 0

or, 4 + 8a = 0

or, a = -1/2

Answer 2

Answer:

from a point of view, answer is 3.