Basic Math Examples

$\frac{q^{2} + 2 q r - 3 r^{2}}{q^{2} - 6 q r + 5 r^{2}} \div \frac{q^{2} + 4 q r + 3 r^{2}}{q^{2} + 4 q r - 45 r^{2}}$

Step 1

To divide by a fraction, multiply by its reciprocal.

$\frac{q^{2} + 2 q r - 3 r^{2}}{q^{2} - 6 q r + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 2

Simplify the numerator.

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Step 2.1

Factor by grouping.

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Step 2.1.1

For a polynomial of the form $a x^{2} + b x + c$ , rewrite the middle term as a sum of two terms whose product is $a \cdot c = 1 \cdot - 3 = - 3$ and whose sum is $b = 2$ .

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Step 2.1.1.1

Reorder terms.

$\frac{q^{2} - 3 r^{2} + 2 q r}{q^{2} - 6 q r + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 2.1.1.2

Reorder $- 3 r^{2}$ and $2 q r$ .

$\frac{q^{2} + 2 q r - 3 r^{2}}{q^{2} - 6 q r + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 2.1.1.3

Factor $2$ out of $2 q r$ .

$\frac{q^{2} + 2 (q r) - 3 r^{2}}{q^{2} - 6 q r + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 2.1.1.4

Rewrite $2$ as $- 1$ plus $3$

$\frac{q^{2} + (- 1 + 3) (q r) - 3 r^{2}}{q^{2} - 6 q r + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 2.1.1.5

Apply the distributive property.

$\frac{q^{2} - 1 (q r) + 3 (q r) - 3 r^{2}}{q^{2} - 6 q r + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 2.1.1.6

Move parentheses.

$\frac{q^{2} - 1 q r + 3 q r - 3 r^{2}}{q^{2} - 6 q r + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 2.1.2

Factor out the greatest common factor from each group.

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Step 2.1.2.1

Group the first two terms and the last two terms.

$\frac{(q^{2} - 1 q r) + 3 q r - 3 r^{2}}{q^{2} - 6 q r + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 2.1.2.2

Factor out the greatest common factor (GCF) from each group.

$\frac{q (q - 1 r) + 3 r (q - r)}{q^{2} - 6 q r + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 2.1.3

Factor the polynomial by factoring out the greatest common factor, $q - 1 r$ .

$\frac{(q - 1 r) (q + 3 r)}{q^{2} - 6 q r + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 2.2

Rewrite $- 1 r$ as $- r$ .

$\frac{(q - r) (q + 3 r)}{q^{2} - 6 q r + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 3

Simplify the denominator.

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Step 3.1

Factor by grouping.

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Step 3.1.1

For a polynomial of the form $a x^{2} + b x + c$ , rewrite the middle term as a sum of two terms whose product is $a \cdot c = 1 \cdot 5 = 5$ and whose sum is $b = - 6$ .

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Step 3.1.1.1

Reorder terms.

$\frac{(q - r) (q + 3 r)}{q^{2} + 5 r^{2} - 6 q r} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 3.1.1.2

Reorder $5 r^{2}$ and $- 6 q r$ .

$\frac{(q - r) (q + 3 r)}{q^{2} - 6 q r + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 3.1.1.3

Factor $- 6$ out of $- 6 q r$ .

$\frac{(q - r) (q + 3 r)}{q^{2} - 6 (q r) + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 3.1.1.4

Rewrite $- 6$ as $- 1$ plus $- 5$

$\frac{(q - r) (q + 3 r)}{q^{2} + (- 1 - 5) (q r) + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 3.1.1.5

Apply the distributive property.

$\frac{(q - r) (q + 3 r)}{q^{2} - 1 (q r) - 5 (q r) + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 3.1.1.6

Move parentheses.

$\frac{(q - r) (q + 3 r)}{q^{2} - 1 q r - 5 q r + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 3.1.2

Factor out the greatest common factor from each group.

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Step 3.1.2.1

Group the first two terms and the last two terms.

$\frac{(q - r) (q + 3 r)}{(q^{2} - 1 q r) - 5 q r + 5 r^{2}} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 3.1.2.2

Factor out the greatest common factor (GCF) from each group.

$\frac{(q - r) (q + 3 r)}{q (q - 1 r) - 5 r (q - r)} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 3.1.3

Factor the polynomial by factoring out the greatest common factor, $q - 1 r$ .

$\frac{(q - r) (q + 3 r)}{(q - 1 r) (q - 5 r)} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 3.2

Rewrite $- 1 r$ as $- r$ .

$\frac{(q - r) (q + 3 r)}{(q - r) (q - 5 r)} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 4

Cancel the common factor of $q - r$ .

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Step 4.1

Cancel the common factor.

$\frac{(q - r) (q + 3 r)}{(q - r) (q - 5 r)} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 4.2

Rewrite the expression.

$\frac{q + 3 r}{q - 5 r} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 5

Factor by grouping.

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Step 5.1

For a polynomial of the form $a x^{2} + b x + c$ , rewrite the middle term as a sum of two terms whose product is $a \cdot c = 1 \cdot - 45 = - 45$ and whose sum is $b = 4$ .

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Step 5.1.1

Reorder terms.

$\frac{q + 3 r}{q - 5 r} \cdot \frac{q^{2} - 45 r^{2} + 4 q r}{q^{2} + 4 q r + 3 r^{2}}$

Step 5.1.2

Reorder $- 45 r^{2}$ and $4 q r$ .

$\frac{q + 3 r}{q - 5 r} \cdot \frac{q^{2} + 4 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 5.1.3

Factor $4$ out of $4 q r$ .

$\frac{q + 3 r}{q - 5 r} \cdot \frac{q^{2} + 4 (q r) - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 5.1.4

Rewrite $4$ as $- 5$ plus $9$

$\frac{q + 3 r}{q - 5 r} \cdot \frac{q^{2} + (- 5 + 9) (q r) - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 5.1.5

Apply the distributive property.

$\frac{q + 3 r}{q - 5 r} \cdot \frac{q^{2} - 5 (q r) + 9 (q r) - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 5.1.6

Move parentheses.

$\frac{q + 3 r}{q - 5 r} \cdot \frac{q^{2} - 5 q r + 9 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 5.2

Factor out the greatest common factor from each group.

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Step 5.2.1

Group the first two terms and the last two terms.

$\frac{q + 3 r}{q - 5 r} \cdot \frac{(q^{2} - 5 q r) + 9 q r - 45 r^{2}}{q^{2} + 4 q r + 3 r^{2}}$

Step 5.2.2

Factor out the greatest common factor (GCF) from each group.

$\frac{q + 3 r}{q - 5 r} \cdot \frac{q (q - 5 r) + 9 r (q - 5 r)}{q^{2} + 4 q r + 3 r^{2}}$

Step 5.3

Factor the polynomial by factoring out the greatest common factor, $q - 5 r$ .

$\frac{q + 3 r}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{q^{2} + 4 q r + 3 r^{2}}$

Step 6

Factor by grouping.

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Step 6.1

For a polynomial of the form $a x^{2} + b x + c$ , rewrite the middle term as a sum of two terms whose product is $a \cdot c = 1 \cdot 3 = 3$ and whose sum is $b = 4$ .

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Step 6.1.1

Reorder terms.

$\frac{q + 3 r}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{q^{2} + 3 r^{2} + 4 q r}$

Step 6.1.2

Reorder $3 r^{2}$ and $4 q r$ .

$\frac{q + 3 r}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{q^{2} + 4 q r + 3 r^{2}}$

Step 6.1.3

Factor $4$ out of $4 q r$ .

$\frac{q + 3 r}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{q^{2} + 4 (q r) + 3 r^{2}}$

Step 6.1.4

Rewrite $4$ as $1$ plus $3$

$\frac{q + 3 r}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{q^{2} + (1 + 3) (q r) + 3 r^{2}}$

Step 6.1.5

Apply the distributive property.

$\frac{q + 3 r}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{q^{2} + 1 (q r) + 3 (q r) + 3 r^{2}}$

Step 6.1.6

Multiply $q r$ by $1$ .

$\frac{q + 3 r}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{q^{2} + q r + 3 (q r) + 3 r^{2}}$

Step 6.1.7

Move parentheses.

$\frac{q + 3 r}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{q^{2} + q r + 3 q r + 3 r^{2}}$

Step 6.2

Factor out the greatest common factor from each group.

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Step 6.2.1

Group the first two terms and the last two terms.

$\frac{q + 3 r}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{(q^{2} + q r) + 3 q r + 3 r^{2}}$

Step 6.2.2

Factor out the greatest common factor (GCF) from each group.

$\frac{q + 3 r}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{q (q + r) + 3 r (q + r)}$

Step 6.3

Factor the polynomial by factoring out the greatest common factor, $q + r$ .

$\frac{q + 3 r}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{(q + r) (q + 3 r)}$

Step 7

Cancel the common factor of $q + 3 r$ .

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Step 7.1

Factor $q + 3 r$ out of $(q + r) (q + 3 r)$ .

$\frac{q + 3 r}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{(q + 3 r) (q + r)}$

Step 7.2

Cancel the common factor.

$\frac{q + 3 r}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{(q + 3 r) (q + r)}$

Step 7.3

Rewrite the expression.

$\frac{1}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{q + r}$

Step 8

Cancel the common factor of $q - 5 r$ .

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Step 8.1

Cancel the common factor.

$\frac{1}{q - 5 r} \cdot \frac{(q - 5 r) (q + 9 r)}{q + r}$

Step 8.2

Rewrite the expression.

$\frac{q + 9 r}{q + r}$