Let us denote Sn = (a^n) + (b^n) +( c^n) for arbitrary numbers a, b, c. It is known that S1 = 8,5, S2 = 74, 25, S3 = 639, 625 for some values of a, b, c. What is the largest possible value of (S811)^2 - S810.S812?
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Expert's answer
2020-11-26T16:58:57-0500
S8112−S810∗S812=(a811+b811+c811)2−(a810+b810+c810)∗(a812+b812+c812)=a1622+b1622+c1622+2a811b811+2a811c811++2b811c811−a1622−b1622−c1622−a810(b812+c812)−−b810(a812+c812)−c810(a812+b812)==2a811b811+2a811c811+2b811c811−a810(b812+c812)−−b810(a812+c812)−c810(a812+b812)⎩⎨⎧a+b+c=8.5a2+b2+c2=74.25a3+b3+c3=639.625since the system is symmetric there will be only one solution:a=0,b=417−4305,c=417+43052(417−4305)811(417+4305)811−−(417−4305)810(417+4305)812−−(417+4305)810(417−4305)812==−(417−4305)810(417+4305)810∗∗((417−4305)2+2(417−4305)(417+4305)+(417+4305)2)==−(16289−305)811∗(4289)=−(−1)811∗(4289)=72.25answer:72.25
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