Ffactor
y\left(9y-1\right)\left(9y+1\right)
Enrhifo
y\left(81y^{2}-1\right)
Graff
Rhannu
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y\left(81y^{2}-1\right)
Ffactora allan y.
\left(9y-1\right)\left(9y+1\right)
Ystyriwch 81y^{2}-1. Ailysgrifennwch 81y^{2}-1 fel \left(9y\right)^{2}-1^{2}. Gellir ffactorio’r gwahaniaeth rhwng sgwariau gan ddefnyddio’r rheol: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
y\left(9y-1\right)\left(9y+1\right)
Ailysgrifennwch y mynegiad cyfan wedi'i ffactorio.
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