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x2 + 3x + 28 can not be factored.

If on the other hand you meant to type:

x2 + 3x - 28

That can indeed be factored:

= x2 + 7x - 4x - 28

= x(x + 7) - 4(x + 7)

= (x - 4)(x + 7)

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Q: How do you factor x2 3x 28?
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