Question 181492
{{{(2-sqrt(5))(2+sqrt(5))}}}
:
multiplying this out you get
:
{{{4+2sqrt(5)-2sqrt(5)-5}}}.....the terms in the middle cancel each other
:
{{{highlight(4-5=-1)}}}
:
{{{sqrt(48a^5b/12ab)}}}
:
{{{sqrt(4cross(48)a^4cross(a^5)cross(b)/cross(12)cross(a)cross(b))}}}
:
{{{sqrt(4a^4)=2a^2}}}