Question 631497
4√(-13) - 6√(-13)



(4 - 6)√(-13)



-2√(-13)



-2√(-1)*√(13)



-2i*√13



So the answer is <img src="http://latex.codecogs.com/gif.latex?\LARGE -2i\sqrt{13}" title="\LARGE -2i\sqrt{13}" />



Note: <img src="http://latex.codecogs.com/gif.latex?\LARGE i = \sqrt{-1}" title="\LARGE 2i\sqrt{13}" />



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