Basic Math Examples

$\frac{r^{2} - 2 r}{r^{2} + 8 r + 12} \div \frac{r^{3} - 5 r^{2} + 6 r}{r^{2} + 10 r + 24} \div \frac{r + 4}{r + 2}$

Step 1

Factor $r$ out of $r^{2} - 2 r$ .

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Step 1.1

Factor $r$ out of $r^{2}$ .

$\frac{r \cdot r - 2 r}{r^{2} + 8 r + 12} \div \frac{r^{3} - 5 r^{2} + 6 r}{r^{2} + 10 r + 24} \div \frac{r + 4}{r + 2}$

Step 1.2

Factor $r$ out of $- 2 r$ .

$\frac{r \cdot r + r \cdot - 2}{r^{2} + 8 r + 12} \div \frac{r^{3} - 5 r^{2} + 6 r}{r^{2} + 10 r + 24} \div \frac{r + 4}{r + 2}$

Step 1.3

Factor $r$ out of $r \cdot r + r \cdot - 2$ .

$\frac{r (r - 2)}{r^{2} + 8 r + 12} \div \frac{r^{3} - 5 r^{2} + 6 r}{r^{2} + 10 r + 24} \div \frac{r + 4}{r + 2}$

Step 2

Factor $r^{2} + 8 r + 12$ using the AC method.

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Step 2.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $12$ and whose sum is $8$ .

$2, 6$

Step 2.2

Write the factored form using these integers.

$\frac{r (r - 2)}{(r + 2) (r + 6)} \div \frac{r^{3} - 5 r^{2} + 6 r}{r^{2} + 10 r + 24} \div \frac{r + 4}{r + 2}$

Step 3

Factor $r$ out of $r^{3} - 5 r^{2} + 6 r$ .

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Step 3.1

Factor $r$ out of $r^{3}$ .

$\frac{r (r - 2)}{(r + 2) (r + 6)} \div \frac{r \cdot r^{2} - 5 r^{2} + 6 r}{r^{2} + 10 r + 24} \div \frac{r + 4}{r + 2}$

Step 3.2

Factor $r$ out of $- 5 r^{2}$ .

$\frac{r (r - 2)}{(r + 2) (r + 6)} \div \frac{r \cdot r^{2} + r (- 5 r) + 6 r}{r^{2} + 10 r + 24} \div \frac{r + 4}{r + 2}$

Step 3.3

Factor $r$ out of $6 r$ .

$\frac{r (r - 2)}{(r + 2) (r + 6)} \div \frac{r \cdot r^{2} + r (- 5 r) + r \cdot 6}{r^{2} + 10 r + 24} \div \frac{r + 4}{r + 2}$

Step 3.4

Factor $r$ out of $r \cdot r^{2} + r (- 5 r)$ .

$\frac{r (r - 2)}{(r + 2) (r + 6)} \div \frac{r (r^{2} - 5 r) + r \cdot 6}{r^{2} + 10 r + 24} \div \frac{r + 4}{r + 2}$

Step 3.5

Factor $r$ out of $r (r^{2} - 5 r) + r \cdot 6$ .

$\frac{r (r - 2)}{(r + 2) (r + 6)} \div \frac{r (r^{2} - 5 r + 6)}{r^{2} + 10 r + 24} \div \frac{r + 4}{r + 2}$

Step 4

Factor.

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Step 4.1

Factor $r^{2} - 5 r + 6$ using the AC method.

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Step 4.1.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $6$ and whose sum is $- 5$ .

$- 3, - 2$

Step 4.1.2

Write the factored form using these integers.

$\frac{r (r - 2)}{(r + 2) (r + 6)} \div \frac{r ((r - 3) (r - 2))}{r^{2} + 10 r + 24} \div \frac{r + 4}{r + 2}$

Step 4.2

Remove unnecessary parentheses.

$\frac{r (r - 2)}{(r + 2) (r + 6)} \div \frac{r (r - 3) (r - 2)}{r^{2} + 10 r + 24} \div \frac{r + 4}{r + 2}$

Step 5

Factor $r^{2} + 10 r + 24$ using the AC method.

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Step 5.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $24$ and whose sum is $10$ .

$4, 6$

Step 5.2

Write the factored form using these integers.

$\frac{r (r - 2)}{(r + 2) (r + 6)} \div \frac{r (r - 3) (r - 2)}{(r + 4) (r + 6)} \div \frac{r + 4}{r + 2}$