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Q: What is 5n2 31n-72?
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What is the square roots of -10-5n2-330?

√(-10 - 5n2 - 330) = i√(5n2 + 340) = i√[(5(n2 + 68)]


What is 5nsq. plus 17n plus 6?

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Take 5 out. If the missing signs are pluses, it becomes 5(n2 + 2n + 4) If the missing signs are minuses, it becomes 5(n2 - 2n - 4)


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There are infinitely many rules that can generate this sequence. As imple one is Un = 5n2 - 21n +72 for n = 1, 2, 3, ... And then n = 4 gives U4 = 68


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5n2 + 2n + 6 = 0 is a quadratic equation in the variable n.The equation does not have any real roots. The roots are the complex conjugate pair -0.2 ± 1.077i where i is the imaginary square root of -1.