Question 1179062

Change the subject of the formula b= 2+sqrt a/ 2-sqrt a  to a.
<pre>Depends on whether it is: {{{matrix(1,7, b, "=", 2 + sqrt(a)/2 - sqrt(a), or, b, "=", (2 + sqrt(a))/(2 - sqrt(a)))}}}.
If it's the former, then the answer the other person gave is WRONG, AS USUAL!