Datrys ar gyfer x_2
x_{2}=\sqrt{5}-1\approx 1.236067977
Neilltuo x_2
x_{2}≔\sqrt{5}-1
Rhannu
Copïo i clipfwrdd
x_{2}=\frac{-2+2\sqrt{5}}{2}
Ffactora 20=2^{2}\times 5. Ailysgrifennu ail isradd y lluoswm \sqrt{2^{2}\times 5} fel lluoswm ail israddau \sqrt{2^{2}}\sqrt{5}. Cymryd isradd 2^{2}.
x_{2}=-1+\sqrt{5}
Rhannu pob term -2+2\sqrt{5} â 2 i gael -1+\sqrt{5}.
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