Explain why the expression 7•3x is not equal to the expression 21x

The expression 7•3x is not equal to the expression 21x. You might think that the two expressions are the same since 7x3 is 21 but the first expression is a dot product. This kind of expression includes the magnitude and direction of the vector in an expression, for example, 7•3x. The second expression, 21x, expresses only the magnitude and does not include the direction.