Datrys 2left(5n+1right)left(4n-4/5right)

$$2 \left( 5n+1 \right) \left( 4n- \frac{ 4 }{ 5 } \right)$$

Enrhifo

$$40n^{2}-\frac{8}{5}$$

Camau Ateb

Defnyddio’r briodwedd ddosbarthu i luosi 2 â 5n+1.

$$\left(10n+2\right)\left(4n-\frac{4}{5}\right)$$

Cyfrifwch y briodoledd ddosrannol drwy luosi pob 10n+2 gan bob 4n-\frac{4}{5}.

$$40n^{2}+10n\left(-\frac{4}{5}\right)+8n+2\left(-\frac{4}{5}\right)$$

Mynegwch 10\left(-\frac{4}{5}\right) fel ffracsiwn unigol.

$$40n^{2}+\frac{10\left(-4\right)}{5}n+8n+2\left(-\frac{4}{5}\right)$$

Lluosi 10 a -4 i gael -40.

$$40n^{2}+\frac{-40}{5}n+8n+2\left(-\frac{4}{5}\right)$$

Rhannu -40 â 5 i gael -8.

$$40n^{2}-8n+8n+2\left(-\frac{4}{5}\right)$$

Cyfuno -8n a 8n i gael 0.

$$40n^{2}+2\left(-\frac{4}{5}\right)$$

Mynegwch 2\left(-\frac{4}{5}\right) fel ffracsiwn unigol.

$$40n^{2}+\frac{2\left(-4\right)}{5}$$

Lluosi 2 a -4 i gael -8.

$$40n^{2}+\frac{-8}{5}$$

Gellir ailysgrifennu \frac{-8}{5} fel -\frac{8}{5} drwy echdynnu’r arwydd negatif.

$$40n^{2}-\frac{8}{5}$$

Ehangu

$$40n^{2}-\frac{8}{5}$$

Camau Ateb

Defnyddio’r briodwedd ddosbarthu i luosi 2 â 5n+1.

$$\left(10n+2\right)\left(4n-\frac{4}{5}\right)$$

Cyfrifwch y briodoledd ddosrannol drwy luosi pob 10n+2 gan bob 4n-\frac{4}{5}.

$$40n^{2}+10n\left(-\frac{4}{5}\right)+8n+2\left(-\frac{4}{5}\right)$$

Mynegwch 10\left(-\frac{4}{5}\right) fel ffracsiwn unigol.

$$40n^{2}+\frac{10\left(-4\right)}{5}n+8n+2\left(-\frac{4}{5}\right)$$

Lluosi 10 a -4 i gael -40.

$$40n^{2}+\frac{-40}{5}n+8n+2\left(-\frac{4}{5}\right)$$

Rhannu -40 â 5 i gael -8.

$$40n^{2}-8n+8n+2\left(-\frac{4}{5}\right)$$

Cyfuno -8n a 8n i gael 0.

$$40n^{2}+2\left(-\frac{4}{5}\right)$$

Mynegwch 2\left(-\frac{4}{5}\right) fel ffracsiwn unigol.

$$40n^{2}+\frac{2\left(-4\right)}{5}$$

Lluosi 2 a -4 i gael -8.

$$40n^{2}+\frac{-8}{5}$$

Gellir ailysgrifennu \frac{-8}{5} fel -\frac{8}{5} drwy echdynnu’r arwydd negatif.

$$40n^{2}-\frac{8}{5}$$