{1/(4+√15)}^2 = Choose the correct choice:
A) a. 16+16√15
B) b. 31- 8√15
C) c. 31+ 8√15
D) d. 32- 4√15
E) e. 32 + 4√15
1 / (16 - 8 root15 + 15)   = 1 / (31 + 8 root15)   Multiply numeratordenominator by (31 - 8 root15)   = (31 + 8 root15) / (961-960) = (31 - 8 root15)   Answer = b. 31- 8√15
<result>B</result>
{1/(4+√15)}^2 =