Study the example below for the product of conjugate pairs (3 + sqrt(7))(3 - sqrt(7)) =9-3 sqrt 7 +3 sqrt 7 -7 =9-7 =2 Now, find the product (2 + sqrt(5))(2 - sqrt(5)) The product is

- 1

Step-by-step explanation:

we need to know that

( a + b ) × ( a - b ) =

proof :

( a + b ) × ( a - b )

so the ans is :

power property.

a) justify

step-by-step explanation:

justifying is just part of everyday life. justify kind of means proof so i think the answer is a) justify.