Answer:

To simplify the expression 1 upon root7 root6-root13, we need to follow a step-by-step process. Let's break down the solution into different sections to make it easier to understand.

Simplifying the expression:

1. Start by simplifying the expression within the square root. We have root6-root13.
2. To combine these two terms, we need to find a common denominator. In this case, the common denominator for 6 and 13 is 78 (6 x 13).
3. Multiply root6 by root13 and root13 by root6. This gives us root(6 x 13) - root(13 x 6), which simplifies to root78 - root78.
4. Since both terms are equal, they cancel each other out, resulting in 0.

Calculating the reciprocal:

1. Now that we have 0 as the result of the expression within the square root, we can calculate the reciprocal of 0.
2. The reciprocal of 0 is undefined since division by zero is not defined in mathematics.
3. Therefore, the final result of the expression 1 upon root7 root6-root13 is undefined.

Summary:

In summary, the expression 1 upon root7 root6-root13 simplifies to undefined. This is because the expression within the square root results in 0, and the reciprocal of 0 is undefined. It is important to note that division by zero is not defined in mathematics, hence the undefined result.