Question

what is the answer of this 4+√15× 4-√15 ​

Answer 1

Answer:

1

Step-by-step explanation:

4+√15×4-√15=(4)^2-(√15)^2

=16-15

=1

Answer 2

Answer:

1

Step-by-step explanation:

(4+√15)(4-√15)

(a+b)(a-b)=a^2 - b^2

4^2 - (√15)^2

16-15

1