Multiply top and bottom by sqrt(5). This is the same as multiplying by one, so it doesn't change the answer, just the way it looks. For example,
1/sqrt(2) can be rewritten as sqrt(2)/2 by multiplying the top and bottom of the fraction by sqrt(2).
Multiply top and bottom by sqrt(5). This is the same as multiplying by one, so it doesn't change the answer, just the way it looks. For example,
1/sqrt(2) can be rewritten as sqrt(2)/2 by multiplying the top and bottom of the fraction by sqrt(2).