Hi I really need help s with this question please
 
											 
											3x^4 y - 48x^2 y =
3x^2 y ( x^2 - 16 ) =
3x^2 y ( x - 4 )( x + 4 )
Answer:
-45x²y
so basically you subtract the numbers and then the indices
edit: just realised this was the wrong method x