In the denominator, it starts as 2+2 sqrt 3.

... 2+2 = 4, of course.

Then before reducing the denominator and numerator by 2, it gets converted to 2*1 sqrt 3.

... But 2*1 = 2.

Why does this work? Would you help me to understand it? My brother was lost on this one too.

Thanks.

... 2+2 = 4, of course.

Then before reducing the denominator and numerator by 2, it gets converted to 2*1 sqrt 3.

... But 2*1 = 2.

Why does this work? Would you help me to understand it? My brother was lost on this one too.

Thanks.