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anemone
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Prove that $(-1,\,\pm 1)$, $(0,\,\pm 1)$, $(3,\,\pm 11)$ are the only integers solution for the equation $y^2=x^4+x^3+x^2+x+1$.
explanation here:Albert said:$x,y $ are integers
let :$y^2=x^4+x^3+x^2+x+1=k-----(1)$
here $k\in N$ ,and $k$ is a perfect square
we have :$(x-1)(x^4+x^3+x^2+x+1)=k(x-1)$
or $x^5-kx+k-1=0----(2)$
if $k=1$ then the solutions of (1):$(x,k)=(-1,1),(0,1),$and two complex conjugates
soluions of (2):$(x,k)=(-1,1),(0,1),(1,1) $ and two complex conjugates
if $k>1$ then the solutions of(1):1 positive , 1 negative and two complex conjugates(idependent of k)
the solutions of(2):2 positive , 1 negative and two complex conjugates
we are given :the solutins of (1):$(x,k)=(-1,1),(0,1),(3,121)$
and we have the soltions of (2):$(x,k)=(-1,1),(0,1),(3,121),(1,k)$
so $(x,y)=(-1,\pm 1),(0,\pm1),(3,\pm 11) $ are the only possible solutions
The Integer Solutions Challenge is a mathematical problem-solving challenge that involves finding integer solutions (whole numbers) to a given equation or set of equations. It is often used to test problem-solving skills and logical thinking.
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