What is the product of the radical expression? (7 - sqrt(7))(- 6 + sqrt(7))

To find the product of the expression, we can use the FOIL method.

(7 - √7)(-6 + √7)

= 7*(-6) + 7*√7 + (-√7)*(-6) + (-√7)*√7
= -42 + 7√7 + 6√7 - √(7*7)
= -42 + 13√7 - 7
= -49 + 13√7

Therefore, the product of the radical expression (7 - √7)(-6 + √7) is -49 + 13√7.