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Let r and s be the roots of x^2 - 6x + 2 = 0. Find 2r + 2s.

 Jan 26, 2022
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By Vieta, the two roots add up to -b in the quadratic, as long as 'a' is 1. Thus, r + s = 6, so 2r + 2s = 12.

 

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 Jan 26, 2022

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