00:01
Hi, today we are solving the question in which the magnitude of vector a and vector b.
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Vector a and vector b is equals to root 3.
00:15
So, we need to determine vector a minus 3 and vector b.
00:24
So, vector a minus 3 b vector into vector a plus 2 b vector.
00:41
So, here if we see we know that the magnitudes of vector a and b are both 1 since they are unit vectors and the magnitude of the sum of vector a and b is equals to root 3.
00:58
So, we have vector a magnitude and vector b magnitude.
01:06
So, first of all we say that if we put together the values.
01:14
So, mod vector a magnitude of mod vector a plus mod vector b square.
01:26
So, it is equals to root 3 square that will be equal to 3.
01:31
Now, expanding the dot product.
01:34
So, vector a plus 2 b vector and vector b is plus 3 vector...