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Anonymous
1 and 3
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3x2 = 21 describes two single values, and does not have an x intercept. 3x2 = 21 ∴ x2 = 7 ∴ x = ±√7
3x2 + 17x + c = 0, rearranging gives c = -3x2 - 17x
x=-.25.
Yes.
One factor is 3.