{1/(4-√15)} =
Choices.
A) a. 16+16√15  B) b. 31- 8√15  C) c. 31+ 8√15  D) d. 32- 4√15  E) e. 4 + √15
= 1 / (4 - root15)   Multiply numeratordenominator by (4+ root15)   = (4 + root15) / (16-15) = (4 + root15)   Answer = e. 4 + √15
<result>E</result>
{1/(4-√15)} =