Question 616638
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Hi, 
f(x) = 8x3 + 31x2 + 23x + 6; c = -3
f(-3) = 0, yes, (x+3) is a factor
Using synthetic Division
-3	8	31	23	6
		-24	-21	-6
	8	7	2	0
f(x) = 8x3 + 31x2 + 23x + 6 = (x+3)(8x^2 + 7x + 2)