Answer:
To perform the operation (9x^2-9x-7)-(x^2-6x-2), we need to distribute the negative sign to the second expression and then combine like terms. This gives:
9x^2 - 9x - 7 - x^2 + 6x + 2
Simplifying, we can combine the x^2 and x terms, as well as the constant terms:
8x^2 - 3x - 5
Therefore, the result of the operation is 8x^2 - 3x - 5.