Datrys ar gyfer x
x\in (-\infty,-20]\cup [20,\infty)
Graff
Rhannu
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x^{2}\geq 400
Ychwanegu 400 at y ddwy ochr.
x^{2}\geq 20^{2}
Cyfrifo ail isradd 400 a chael 20. Ailysgrifennwch 400 fel 20^{2}.
|x|\geq 20
Mae anghydraddoldeb ar gyfer |x|\geq 20.
x\leq -20\text{; }x\geq 20
Ailysgrifennwch |x|\geq 20 fel x\leq -20\text{; }x\geq 20.
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