1/(4-√15)=? Choose the correct choice from the following answers.
A) 4+√15	B) 9-4√5	C) 9+2√5	D) 9-2√5	E) 4+9√5
This question requires us to rationalize (fix) the denominator.   For more on this technique, seehttps://www.gmatprepnow.com/module/gmat ... video/1044   Given: 1/(4-√15)   Multiply top and bottom by the CONJUG4+√15TE of 4-√15, which is 4+√15   So, 1/(4-√15) = (1)(4+√15)/(4-√15)(4+√15)   = (4+√15)/(1)   = 4+√15   =   4+√15
<result>A</result>
1/(4-√15)=?