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joeylozier15
07.05.2021 •
Mathematics
What is the final step to prove that Sn 1 + 2 + 3 + ... + n = n(n+1)/2? a. Verify that Sn is valid for n = 1 c. Assume that Sn is valid for n = k b. Show that Sn is valid for n = k d. Prove that Sn is valid for n = k + 1
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Ответ:
x = [--10 +/- sqrt (100-4*-6)] / 2
= (10 +/- sqrt 124) / 2
= 5 + sqrt31 and 5 - sqrt31 Answer