Réitigh do x.
x\in \begin{bmatrix}-\frac{\sqrt{5}}{5},\frac{\sqrt{5}}{5}\end{bmatrix}
Graf
Tráth na gCeist
Algebra
5 fadhbanna cosúil le:
x ^ { 2 } 5 \leq 1
Roinn
Cóipeáladh go dtí an ghearrthaisce
x^{2}\leq \frac{1}{5}
Roinn an dá thaobh faoi 5. De bhrí go bhfuil 5 dearfach, fanann an treoir éagothroime mar an gcéanna.
x^{2}\leq \left(\frac{\sqrt{5}}{5}\right)^{2}
Áirigh fréamh chearnach \frac{1}{5} agus faigh \frac{\sqrt{5}}{5}. Athscríobh \frac{1}{5} mar \left(\frac{\sqrt{5}}{5}\right)^{2}.
|x|\leq \frac{\sqrt{5}}{5}
Tá éagothromóid i gceist do: |x|\leq \frac{\sqrt{5}}{5}.
x\in \begin{bmatrix}-\frac{\sqrt{5}}{5},\frac{\sqrt{5}}{5}\end{bmatrix}
Athscríobh |x|\leq \frac{\sqrt{5}}{5} mar x\in \left[-\frac{\sqrt{5}}{5},\frac{\sqrt{5}}{5}\right].
Samplaí
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{ x } ^ { 2 } - 4 x - 5 = 0
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