Explanation:
3x² - 5x - 7 ÷ x + 3 = 3x - 14
- 3x² + 9x
-------------------
0 -14x - 7
- -14x -42
---------------------
0 + 35
so, the division is
(3x² - 5x - 7) / (x + 3) = 3x - 14 + 35/(x+3)
quotient = 3x - 14
remainder = 35
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