Question

Express (root 19 - root 7)(root 19 + root 7) in simplest form.

Answer 1

12

Explanation:

(√19 -√7)(√19 +√7)

( a +b)( a -b) = a²-b²

(√19)² -(√7)² = 19 -7 = 12

Answer 2

root 354

Explanation: