i am sorry for my English. i saw both two rings are equal in the book but i dont know why. Please can anyone explain why ? or is it true ?
$Z + 7Z\sqrt{98}=Z+7Z\sqrt{2}$
And also is this true ? $Z+7Z\sqrt{2}=Z+Z\sqrt{98}$
2026-04-13 21:41:42.1776116502
why are these rings equal ? Z+...
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Hinty without words (assuming there's no $\;7\;$ in your left side):
$$\sqrt{98}=7\sqrt2$$