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Best Answer

Factorising, we obtain,

x2 + 10x + 21 = (x + 7)(x + 3).

Thus,

x2 + 10x + 21 / (x + 3) = x + 7.

That's usually easier than dividing it out!

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14y ago
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Q: X squared plus 10x plus 21 divided by x plus 3?
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