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The factors are : (x² + 3) and (x + 5). Here's how I got that:

I plotted it and found it crosses the x-axis at x = -5. Substituting x = -5 verifies that -5 is a root. So one of the factors is (x + 5).

Using long division: (x³ + 5x² + 3x + 15)/(x+5) = x² + 3.

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14y ago

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