00:01
We want to determine whether the following vectors are mutually orthogonal.
00:07
U1 is 1, negative 2, 1.
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U2 is 0, 1, 2.
00:12
And u3 is negative 5, negative 2, 1.
00:17
So to be mutually orthogonal, we take any two different vectors in this set and find the inner product or dot product of if all the inner products of different vectors is equal to 0, then the vectors are mutually orthogonal.
00:37
So let's do first inner product of u1 times u2.
00:43
So this inner product is the number which is obtained by the sum of the products of the corresponding components.
00:59
That is 1 times 0, that is first component of u times first component of u2, first component of u1 times third component of u2, plus second component of u1 negative 2 times second component of u2, plus third component of u1 times second and third component of u2 is 2.
01:27
Now we do the operations 0, negative 2 plus 2 and that is 0.
01:33
Now let's do u2 times inner product u3.
01:40
So we get first component of u2 times first component of u3 is 0 times negative 5 plus second component of u2 times second component of u3 is 1 times negative 2 plus third component of u2 times third component of u3 is 2 times 1...