What is the product of the radical expression?

(7 - /7)(-6 + /7)
-49 - 42 /7
-49 + 13 /7
-35 - 42 /7
-6 + /7
Where / means square root

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