Question

Expand, then simple of the following numerical expressions:

a)(1+√5)(2-√5)

b)(1+√6)(√2+√3)

c)(2-√6)(√2+√3)​

Answer 1

a one bracket 2 minus root 5 bracket root 5 (2 minus root 5

= 2 - root 5 + 2 root 5 - 5

= - 3 + root 5