Basic Math Examples

$\frac{6 z + 3 r}{7 z r^{2}} - \frac{2 z - 4 r}{z^{2} - r}$

Step 1

Factor $2$ out of $2 z - 4 r$ .

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Step 1.1

Factor $2$ out of $2 z$ .

$\frac{6 z + 3 r}{7 z r^{2}} - \frac{2 (z) - 4 r}{z^{2} - r}$

Step 1.2

Factor $2$ out of $- 4 r$ .

$\frac{6 z + 3 r}{7 z r^{2}} - \frac{2 (z) + 2 (- 2 r)}{z^{2} - r}$

Step 1.3

Factor $2$ out of $2 (z) + 2 (- 2 r)$ .

$\frac{6 z + 3 r}{7 z r^{2}} - \frac{2 (z - 2 r)}{z^{2} - r}$

Step 2

To write $\frac{6 z + 3 r}{7 z r^{2}}$ as a fraction with a common denominator, multiply by $\frac{z^{2} - r}{z^{2} - r}$ .

$\frac{6 z + 3 r}{7 z r^{2}} \cdot \frac{z^{2} - r}{z^{2} - r} - \frac{2 (z - 2 r)}{z^{2} - r}$

Step 3

To write $- \frac{2 (z - 2 r)}{z^{2} - r}$ as a fraction with a common denominator, multiply by $\frac{7 z r^{2}}{7 z r^{2}}$ .

$\frac{6 z + 3 r}{7 z r^{2}} \cdot \frac{z^{2} - r}{z^{2} - r} - \frac{2 (z - 2 r)}{z^{2} - r} \cdot \frac{7 z r^{2}}{7 z r^{2}}$

Step 4

Write each expression with a common denominator of $7 z (z^{2} - r) r^{2}$ , by multiplying each by an appropriate factor of $1$ .

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Step 4.1

Multiply $\frac{6 z + 3 r}{7 z r^{2}}$ by $\frac{z^{2} - r}{z^{2} - r}$ .

$\frac{(6 z + 3 r) (z^{2} - r)}{7 z r^{2} (z^{2} - r)} - \frac{2 (z - 2 r)}{z^{2} - r} \cdot \frac{7 z r^{2}}{7 z r^{2}}$

Step 4.2

Multiply $\frac{2 (z - 2 r)}{z^{2} - r}$ by $\frac{7 z r^{2}}{7 z r^{2}}$ .

$\frac{(6 z + 3 r) (z^{2} - r)}{7 z r^{2} (z^{2} - r)} - \frac{2 (z - 2 r) (7 z r^{2})}{(z^{2} - r) (7 z r^{2})}$

Step 4.3

Reorder the factors of $7 z r^{2} (z^{2} - r)$ .

$\frac{(6 z + 3 r) (z^{2} - r)}{7 r^{2} z (z^{2} - r)} - \frac{2 (z - 2 r) (7 z r^{2})}{(z^{2} - r) (7 z r^{2})}$

Step 4.4

Reorder the factors of $(z^{2} - r) (7 z r^{2})$ .

$\frac{(6 z + 3 r) (z^{2} - r)}{7 r^{2} z (z^{2} - r)} - \frac{2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 5

Combine the numerators over the common denominator.

$\frac{(6 z + 3 r) (z^{2} - r) - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6

Rewrite $\frac{(6 z + 3 r) (z^{2} - r) - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$ in a factored form.

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Step 6.1

Expand $(6 z + 3 r) (z^{2} - r)$ using the FOIL Method.

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Step 6.1.1

Apply the distributive property.

$\frac{6 z (z^{2} - r) + 3 r (z^{2} - r) - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.1.2

Apply the distributive property.

$\frac{6 z \cdot z^{2} + 6 z (- r) + 3 r (z^{2} - r) - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.1.3

Apply the distributive property.

$\frac{6 z \cdot z^{2} + 6 z (- r) + 3 r z^{2} + 3 r (- r) - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.2

Simplify each term.

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Step 6.2.1

Multiply $z$ by $z^{2}$ by adding the exponents.

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Step 6.2.1.1

Move $z^{2}$ .

$\frac{6 (z^{2} z) + 6 z (- r) + 3 r z^{2} + 3 r (- r) - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.2.1.2

Multiply $z^{2}$ by $z$ .

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Step 6.2.1.2.1

Raise $z$ to the power of $1$ .

$\frac{6 (z^{2} z^{1}) + 6 z (- r) + 3 r z^{2} + 3 r (- r) - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.2.1.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{6 z^{2 + 1} + 6 z (- r) + 3 r z^{2} + 3 r (- r) - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.2.1.3

Add $2$ and $1$ .

$\frac{6 z^{3} + 6 z (- r) + 3 r z^{2} + 3 r (- r) - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.2.2

Rewrite using the commutative property of multiplication.

$\frac{6 z^{3} + 6 \cdot - 1 z r + 3 r z^{2} + 3 r (- r) - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.2.3

Multiply $6$ by $- 1$ .

$\frac{6 z^{3} - 6 z r + 3 r z^{2} + 3 r (- r) - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.2.4

Rewrite using the commutative property of multiplication.

$\frac{6 z^{3} - 6 z r + 3 r z^{2} + 3 \cdot - 1 r \cdot r - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.2.5

Multiply $r$ by $r$ by adding the exponents.

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Step 6.2.5.1

Move $r$ .

$\frac{6 z^{3} - 6 z r + 3 r z^{2} + 3 \cdot - 1 (r \cdot r) - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.2.5.2

Multiply $r$ by $r$ .

$\frac{6 z^{3} - 6 z r + 3 r z^{2} + 3 \cdot - 1 r^{2} - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.2.6

Multiply $3$ by $- 1$ .

$\frac{6 z^{3} - 6 z r + 3 r z^{2} - 3 r^{2} - 2 (z - 2 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.3

Apply the distributive property.

$\frac{6 z^{3} - 6 z r + 3 r z^{2} - 3 r^{2} + (- 2 z - 2 (- 2 r)) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.4

Multiply $- 2$ by $- 2$ .

$\frac{6 z^{3} - 6 z r + 3 r z^{2} - 3 r^{2} + (- 2 z + 4 r) (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.5

Apply the distributive property.

$\frac{6 z^{3} - 6 z r + 3 r z^{2} - 3 r^{2} - 2 z (7 z r^{2}) + 4 r (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.6

Multiply $z$ by $z$ by adding the exponents.

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Step 6.6.1

Move $z$ .

$\frac{6 z^{3} - 6 z r + 3 r z^{2} - 3 r^{2} - 2 (z \cdot z) (7 r^{2}) + 4 r (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.6.2

Multiply $z$ by $z$ .

$\frac{6 z^{3} - 6 z r + 3 r z^{2} - 3 r^{2} - 2 z^{2} (7 r^{2}) + 4 r (7 z r^{2})}{7 r^{2} z (z^{2} - r)}$

Step 6.7

Multiply $r$ by $r^{2}$ by adding the exponents.

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Step 6.7.1

Move $r^{2}$ .

$\frac{6 z^{3} - 6 z r + 3 r z^{2} - 3 r^{2} - 2 z^{2} (7 r^{2}) + 4 (r^{2} r) (7 z)}{7 r^{2} z (z^{2} - r)}$

Step 6.7.2

Multiply $r^{2}$ by $r$ .

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Step 6.7.2.1

Raise $r$ to the power of $1$ .

$\frac{6 z^{3} - 6 z r + 3 r z^{2} - 3 r^{2} - 2 z^{2} (7 r^{2}) + 4 (r^{2} r^{1}) (7 z)}{7 r^{2} z (z^{2} - r)}$

Step 6.7.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{6 z^{3} - 6 z r + 3 r z^{2} - 3 r^{2} - 2 z^{2} (7 r^{2}) + 4 r^{2 + 1} (7 z)}{7 r^{2} z (z^{2} - r)}$

Step 6.7.3

Add $2$ and $1$ .

$\frac{6 z^{3} - 6 z r + 3 r z^{2} - 3 r^{2} - 2 z^{2} (7 r^{2}) + 4 r^{3} (7 z)}{7 r^{2} z (z^{2} - r)}$

Step 6.8

Simplify each term.

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Step 6.8.1

Rewrite using the commutative property of multiplication.

$\frac{6 z^{3} - 6 z r + 3 r z^{2} - 3 r^{2} - 2 \cdot 7 z^{2} r^{2} + 4 r^{3} (7 z)}{7 r^{2} z (z^{2} - r)}$

Step 6.8.2

Multiply $- 2$ by $7$ .

$\frac{6 z^{3} - 6 z r + 3 r z^{2} - 3 r^{2} - 14 z^{2} r^{2} + 4 r^{3} (7 z)}{7 r^{2} z (z^{2} - r)}$

Step 6.8.3

Rewrite using the commutative property of multiplication.

$\frac{6 z^{3} - 6 z r + 3 r z^{2} - 3 r^{2} - 14 z^{2} r^{2} + 4 \cdot 7 r^{3} z}{7 r^{2} z (z^{2} - r)}$

Step 6.8.4

Multiply $4$ by $7$ .

$\frac{6 z^{3} - 6 z r + 3 r z^{2} - 3 r^{2} - 14 z^{2} r^{2} + 28 r^{3} z}{7 r^{2} z (z^{2} - r)}$