Question

Please help me with this question​

Answer 1

Answer:

-6

Step-by-step explanation:

Use the identity (A+B)(A-B)=A sq. -Bsq.

5-11=-6

hope it helps...

Answer 2

Step-by-step explanation:

$( \sqrt{5} - \sqrt{11} )( \sqrt{5} + \sqrt{11} ) \\ = { \sqrt{5} }^{2} - { \sqrt{11} }^{2} \\ = 5 - 11 \\ = - 6$