Question

Simplify (2+ root 5) (2 - root 15)​

Answer 1

Step-by-step explanation:

=(2)2 - (root5)2

= 4 - 5

= -1

Answer 2

Answer

(2+√5) (2-√5)

(a+b) (a-b)

a²-b²

(2)²- (√5)²

4 - 5

(-1)