Question

dividing radicals: what's 12/2-√15
is it 2√15/5 or am i wrong? I don't understand wolfram alpha

Answer 1

it is telling you if you rationalize the denominator you will get
\[-\frac{24+12\sqrt{15}}{11}\][

Answer 2

easier just to do it. write
\[\frac{12}{2-\sqrt{15}}\times \frac{2+\sqrt{15}}{2+\sqrt{15}}=\frac{12(2+\sqrt{15})}{-11}\]

Answer 3

oh i see where i went wrong thanks!