## Lluosi llythrennau

Gall mynegiadau algebraidd gael eu lluosi yn yr un ffordd â rhifau.

$${a}\times{a} = {a}^{2}$$,

$${b}\times{b} = {b}^{2}$$ ayyb.

Cofia nad ydy $${2a}$$ yr un fath ag $${a}^{2}$$

${2a} = {2}\times{a}$

${a}^{2} = {a}\times{a}$

Yn gyffredinol, $${a}^{m}\times{a}^{n} = {a}^{({m} + {n})}$$

Question

Symleiddia:

a) $${a}^{2}\times{a}^{3}$$

b) $${p}^{4}\times{p}^{2}$$

a) $${a}^{2} = {a}\times{a}$$ ac $${a}^{3} = {a}\times{a}\times{a}$$, felly:

${a}^{2}\times{a}^{3}={a}\times{a}\times{a}\times{a}\times{a}={a}^{5}$

b) $${p}^{4}\times{p}^{2} = {p}^{({4} + {2})} = {p}^{6}$$

Cofia fod $${x}$$ yr un fath ag $${x}^{1}$$ wrth ddefnyddio’r rheol hon, ee $${n}^{3}\times{n} = {n}^{({3} + {1})} = {n}^{4}$$

## Lluosi rhifau a llythrennau

Lluosa’r llythrennau a’r rhifau ar wahân:

Mae $${2}\times{3a}$$ yn golygu $${2}\times{3}\times{a}$$ sef $${6a}$$

Mae $${4a}\times{5a}$$ yn golygu $${4}\times{a}\times{5}\times{a}$$ sef $${4}\times{5}\times{a}\times{a} = {20a}^{2}$$

Question

Symleiddia $${2p}\times{3p}^{2}$$

${2p}\times{3p}^{2}$

$= {2}\times{p}\times{3}\times{p}\times{p}$

$= {2}\times{3}\times{p}\times{p}\times{p}$

$= {6p}^{3}$