Réitigh r=3a*3(5ab)=

$$r = 3 a \cdot 3 ( 5 a b ) =$$

Réitigh do b. (complex solution)

$$\left\{\begin{matrix}b=\frac{r}{45a^{2}}\text{, }&a\neq 0\\b\in \mathrm{C}\text{, }&r=0\text{ and }a=0\end{matrix}\right.$$

Céimeanna chun Cothromóidí Líneacha a Réiteach

Méadaigh a agus a chun a^{2} a fháil.

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

Méadaigh 3 agus 3 chun 9 a fháil.

$$r=9a^{2}\times 5b$$

Méadaigh 9 agus 5 chun 45 a fháil.

$$r=45a^{2}b$$

Athraigh na taobhanna ionas go mbeidh na téarmaí inathraitheacha ar fad ar an taobh clé.

$$45a^{2}b=r$$

Roinn an dá thaobh faoi 45a^{2}.

$$\frac{45a^{2}b}{45a^{2}}=\frac{r}{45a^{2}}$$

Má roinntear é faoi 45a^{2} cuirtear an iolrúchán faoi 45a^{2} ar ceal.

$$b=\frac{r}{45a^{2}}$$

Réitigh do b.

$$\left\{\begin{matrix}b=\frac{r}{45a^{2}}\text{, }&a\neq 0\\b\in \mathrm{R}\text{, }&r=0\text{ and }a=0\end{matrix}\right.$$

Céimeanna chun Cothromóidí Líneacha a Réiteach

Méadaigh a agus a chun a^{2} a fháil.

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

Méadaigh 3 agus 3 chun 9 a fháil.

$$r=9a^{2}\times 5b$$

Méadaigh 9 agus 5 chun 45 a fháil.

$$r=45a^{2}b$$

Athraigh na taobhanna ionas go mbeidh na téarmaí inathraitheacha ar fad ar an taobh clé.

$$45a^{2}b=r$$

Roinn an dá thaobh faoi 45a^{2}.

$$\frac{45a^{2}b}{45a^{2}}=\frac{r}{45a^{2}}$$

Má roinntear é faoi 45a^{2} cuirtear an iolrúchán faoi 45a^{2} ar ceal.

$$b=\frac{r}{45a^{2}}$$

Réitigh do a. (complex solution)

$$\left\{\begin{matrix}a=-\frac{b^{-\frac{1}{2}}\sqrt{5r}}{15}\text{; }a=\frac{b^{-\frac{1}{2}}\sqrt{5r}}{15}\text{, }&b\neq 0\\a\in \mathrm{C}\text{, }&r=0\text{ and }b=0\end{matrix}\right.$$

Réitigh do a.

$$\left\{\begin{matrix}a=\frac{\sqrt{\frac{5r}{b}}}{15}\text{; }a=-\frac{\sqrt{\frac{5r}{b}}}{15}\text{, }&\left(r\geq 0\text{ and }b>0\right)\text{ or }\left(r\leq 0\text{ and }b<0\right)\\a\in \mathrm{R}\text{, }&r=0\text{ and }b=0\end{matrix}\right.$$