Answer:
2x^2+2x+1
Explanation:
3x + 1 | 6x^3 + 8x^2 + 5x + 1
_____ 6x^3 + 2x^2______ <-- 2x^2
6x^2 + 5x + 1
6x^2 + 2x <-- 2x
3x + 1
3x + 1 <-- 1
0 | 2x^2+2x+1
Therefore, 6x^3+8x^2+5x+1 when divided by 3x+1 is 2x^2+2x+1
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