Ffactor
\frac{\left(5a-1\right)\left(5a+1\right)}{25}
Enrhifo
a^{2}-\frac{1}{25}
Rhannu
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\frac{25a^{2}-1}{25}
Ffactora allan \frac{1}{25}.
\left(5a-1\right)\left(5a+1\right)
Ystyriwch 25a^{2}-1. Ailysgrifennwch 25a^{2}-1 fel \left(5a\right)^{2}-1^{2}. Gellir ffactorio’r gwahaniaeth rhwng sgwariau gan ddefnyddio’r rheol: p^{2}-q^{2}=\left(p-q\right)\left(p+q\right).
\frac{\left(5a-1\right)\left(5a+1\right)}{25}
Ailysgrifennwch y mynegiad cyfan wedi'i ffactorio.
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