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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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โˆ™ 2011-06-07 23:52:25
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โˆ™ 2015-09-26 00:54:39

(x + 5)(x^2 + 3)

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Q: What is the factor of the polynomial expression x3 plus 5x2 plus 3x plus 15?
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