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(xn+2-1)/(x2-1)
Explanation
Let Y=1+x2+x4+...+xn. Now notice that:
Y=1+x2+x4+...+xn=x2(1+x2+x4+...+xn-2)+1
Y+xn+2=x2(1+x2+x4+...+xn-2+xn)+1
Y+xn+2=x2*Y+1
Y+xn+2-x2*Y=1
Y-x2*Y=1-xn+2
Y(1-x2)=1-xn+2
Y=(1-xn+2)/(1-x2)=(xn+2-1)/(x2-1)
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∙ 14y ago
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x2 + 36 cannot be factored. You can only factor the difference of two squares, not the sum.
