Ffactor
\frac{\left(x-15y\right)\left(x+15y\right)}{9}
Enrhifo
\frac{x^{2}}{9}-25y^{2}
Rhannu
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\frac{x^{2}-225y^{2}}{9}
Ffactora allan \frac{1}{9}.
\left(x-15y\right)\left(x+15y\right)
Ystyriwch x^{2}-225y^{2}. Ailysgrifennwch x^{2}-225y^{2} fel x^{2}-\left(15y\right)^{2}. Gellir ffactorio’r gwahaniaeth rhwng sgwariau gan ddefnyddio’r rheol: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
\frac{\left(x-15y\right)\left(x+15y\right)}{9}
Ailysgrifennwch y mynegiad cyfan wedi'i ffactorio.
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