Hi,

1. (x^4-5x^3+8x^2+15x-2)÷(x-3)

3	1	-5	8	15	-2

		3	-6	6	63

	1	-2	2	21	61

 x^3 - 2x^2 +2x + 21  + 61/(x-3)



2.  (x^4+3x^3-4x^2)÷(x+4)

-4	1	3	-4

		-4	4

	1	-1	0

  x^3 - x^2 

Remainder = 0  

(x + 4) a factor

Wish You the Best in your Studies. 

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