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What is the value of the summation ∑i=14(2i+6i2)?
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What is the value of the summation ∑i=14(2i+6i2)?

User Yrazlik
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In the concept of complex numbers, i^2=1; i^3 = -1. So, first, apply distributive property. It would then become 28i + 84i^2. Since i^2 is equal to 1, then the sum would be 28i + 84.

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User Rune Andersen
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