i feel stupid asking this im probably overthinking it..but i cant get the answer wrong so ill ask anyway..

$\displaystyle \sqrt{-4}*\sqrt{-49}$

if i go $\displaystyle \sqrt{-49*-4}=\sqrt{196}=14$

however i can also go(i think) $\displaystyle 2i*7i=14i^2=14*-1=-14$

so is the answer $\displaystyle \pm 14$? or is it one or the other....