Basic Math Examples

$\frac{6}{c + 3} + \frac{3}{c^{2} - c + 9} - \frac{162}{c^{3} + 27}$

Step 1

Simplify the denominator.

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Step 1.1

Rewrite $27$ as $3^{3}$ .

$\frac{6}{c + 3} + \frac{3}{c^{2} - c + 9} - \frac{162}{c^{3} + 3^{3}}$

Step 1.2

Since both terms are perfect cubes, factor using the sum of cubes formula, $a^{3} + b^{3} = (a + b) (a^{2} - a b + b^{2})$ where $a = c$ and $b = 3$ .

$\frac{6}{c + 3} + \frac{3}{c^{2} - c + 9} - \frac{162}{(c + 3) (c^{2} - c \cdot 3 + 3^{2})}$

Step 1.3

Simplify.

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Step 1.3.1

Multiply $3$ by $- 1$ .

$\frac{6}{c + 3} + \frac{3}{c^{2} - c + 9} - \frac{162}{(c + 3) (c^{2} - 3 c + 3^{2})}$

Step 1.3.2

Raise $3$ to the power of $2$ .

$\frac{6}{c + 3} + \frac{3}{c^{2} - c + 9} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 2

To write $\frac{6}{c + 3}$ as a fraction with a common denominator, multiply by $\frac{c^{2} - c + 9}{c^{2} - c + 9}$ .

$\frac{6}{c + 3} \cdot \frac{c^{2} - c + 9}{c^{2} - c + 9} + \frac{3}{c^{2} - c + 9} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 3

To write $\frac{3}{c^{2} - c + 9}$ as a fraction with a common denominator, multiply by $\frac{c + 3}{c + 3}$ .

$\frac{6}{c + 3} \cdot \frac{c^{2} - c + 9}{c^{2} - c + 9} + \frac{3}{c^{2} - c + 9} \cdot \frac{c + 3}{c + 3} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 4

Write each expression with a common denominator of $(c + 3) (c^{2} - c + 9)$ , by multiplying each by an appropriate factor of $1$ .

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Step 4.1

Multiply $\frac{6}{c + 3}$ by $\frac{c^{2} - c + 9}{c^{2} - c + 9}$ .

$\frac{6 (c^{2} - c + 9)}{(c + 3) (c^{2} - c + 9)} + \frac{3}{c^{2} - c + 9} \cdot \frac{c + 3}{c + 3} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 4.2

Multiply $\frac{3}{c^{2} - c + 9}$ by $\frac{c + 3}{c + 3}$ .

$\frac{6 (c^{2} - c + 9)}{(c + 3) (c^{2} - c + 9)} + \frac{3 (c + 3)}{(c^{2} - c + 9) (c + 3)} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 4.3

Reorder the factors of $(c^{2} - c + 9) (c + 3)$ .

$\frac{6 (c^{2} - c + 9)}{(c + 3) (c^{2} - c + 9)} + \frac{3 (c + 3)}{(c + 3) (c^{2} - c + 9)} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 5

Combine the numerators over the common denominator.

$\frac{6 (c^{2} - c + 9) + 3 (c + 3)}{(c + 3) (c^{2} - c + 9)} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 6

Simplify the numerator.

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Step 6.1

Factor $3$ out of $6 (c^{2} - c + 9) + 3 (c + 3)$ .

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Step 6.1.1

Factor $3$ out of $6 (c^{2} - c + 9)$ .

$\frac{3 (2 (c^{2} - c + 9)) + 3 (c + 3)}{(c + 3) (c^{2} - c + 9)} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 6.1.2

Factor $3$ out of $3 (2 (c^{2} - c + 9)) + 3 (c + 3)$ .

$\frac{3 (2 (c^{2} - c + 9) + c + 3)}{(c + 3) (c^{2} - c + 9)} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 6.2

Apply the distributive property.

$\frac{3 (2 c^{2} + 2 (- c) + 2 \cdot 9 + c + 3)}{(c + 3) (c^{2} - c + 9)} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 6.3

Simplify.

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Step 6.3.1

Multiply $- 1$ by $2$ .

$\frac{3 (2 c^{2} - 2 c + 2 \cdot 9 + c + 3)}{(c + 3) (c^{2} - c + 9)} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 6.3.2

Multiply $2$ by $9$ .

$\frac{3 (2 c^{2} - 2 c + 18 + c + 3)}{(c + 3) (c^{2} - c + 9)} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 6.4

Add $- 2 c$ and $c$ .

$\frac{3 (2 c^{2} - c + 18 + 3)}{(c + 3) (c^{2} - c + 9)} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 6.5

Add $18$ and $3$ .

$\frac{3 (2 c^{2} - c + 21)}{(c + 3) (c^{2} - c + 9)} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 7

To write $\frac{3 (2 c^{2} - c + 21)}{(c + 3) (c^{2} - c + 9)}$ as a fraction with a common denominator, multiply by $\frac{c^{2} - 3 c + 9}{c^{2} - 3 c + 9}$ .

$\frac{3 (2 c^{2} - c + 21)}{(c + 3) (c^{2} - c + 9)} \cdot \frac{c^{2} - 3 c + 9}{c^{2} - 3 c + 9} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$

Step 8

To write $- \frac{162}{(c + 3) (c^{2} - 3 c + 9)}$ as a fraction with a common denominator, multiply by $\frac{c^{2} - c + 9}{c^{2} - c + 9}$ .

$\frac{3 (2 c^{2} - c + 21)}{(c + 3) (c^{2} - c + 9)} \cdot \frac{c^{2} - 3 c + 9}{c^{2} - 3 c + 9} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)} \cdot \frac{c^{2} - c + 9}{c^{2} - c + 9}$

Step 9

Write each expression with a common denominator of $(c + 3) (c^{2} - c + 9) (c^{2} - 3 c + 9)$ , by multiplying each by an appropriate factor of $1$ .

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Step 9.1

Multiply $\frac{3 (2 c^{2} - c + 21)}{(c + 3) (c^{2} - c + 9)}$ by $\frac{c^{2} - 3 c + 9}{c^{2} - 3 c + 9}$ .

$\frac{3 (2 c^{2} - c + 21) (c^{2} - 3 c + 9)}{(c + 3) (c^{2} - c + 9) (c^{2} - 3 c + 9)} - \frac{162}{(c + 3) (c^{2} - 3 c + 9)} \cdot \frac{c^{2} - c + 9}{c^{2} - c + 9}$

Step 9.2

Multiply $\frac{162}{(c + 3) (c^{2} - 3 c + 9)}$ by $\frac{c^{2} - c + 9}{c^{2} - c + 9}$ .

$\frac{3 (2 c^{2} - c + 21) (c^{2} - 3 c + 9)}{(c + 3) (c^{2} - c + 9) (c^{2} - 3 c + 9)} - \frac{162 (c^{2} - c + 9)}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 9.3

Reorder the factors of $(c + 3) (c^{2} - c + 9) (c^{2} - 3 c + 9)$ .

$\frac{3 (2 c^{2} - c + 21) (c^{2} - 3 c + 9)}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)} - \frac{162 (c^{2} - c + 9)}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 10

Combine the numerators over the common denominator.

$\frac{3 (2 c^{2} - c + 21) (c^{2} - 3 c + 9) - 162 (c^{2} - c + 9)}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11

Simplify the numerator.

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Step 11.1

Factor $3$ out of $3 (2 c^{2} - c + 21) (c^{2} - 3 c + 9) - 162 (c^{2} - c + 9)$ .

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Step 11.1.1

Factor $3$ out of $3 (2 c^{2} - c + 21) (c^{2} - 3 c + 9)$ .

$\frac{3 ((2 c^{2} - c + 21) (c^{2} - 3 c + 9)) - 162 (c^{2} - c + 9)}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.1.2

Factor $3$ out of $- 162 (c^{2} - c + 9)$ .

$\frac{3 ((2 c^{2} - c + 21) (c^{2} - 3 c + 9)) + 3 (- 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.1.3

Factor $3$ out of $3 ((2 c^{2} - c + 21) (c^{2} - 3 c + 9)) + 3 (- 54 (c^{2} - c + 9))$ .

$\frac{3 ((2 c^{2} - c + 21) (c^{2} - 3 c + 9) - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.2

Expand $(2 c^{2} - c + 21) (c^{2} - 3 c + 9)$ by multiplying each term in the first expression by each term in the second expression.

$\frac{3 (2 c^{2} c^{2} + 2 c^{2} (- 3 c) + 2 c^{2} \cdot 9 - c \cdot c^{2} - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3

Simplify each term.

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Step 11.3.1

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

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Step 11.3.1.1

Move $c^{2}$ .

$\frac{3 (2 (c^{2} c^{2}) + 2 c^{2} (- 3 c) + 2 c^{2} \cdot 9 - c \cdot c^{2} - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.1.2

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

$\frac{3 (2 c^{2 + 2} + 2 c^{2} (- 3 c) + 2 c^{2} \cdot 9 - c \cdot c^{2} - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.1.3

Add $2$ and $2$ .

$\frac{3 (2 c^{4} + 2 c^{2} (- 3 c) + 2 c^{2} \cdot 9 - c \cdot c^{2} - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.2

Rewrite using the commutative property of multiplication.

$\frac{3 (2 c^{4} + 2 \cdot - 3 c^{2} c + 2 c^{2} \cdot 9 - c \cdot c^{2} - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.3

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

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Step 11.3.3.1

Move $c$ .

$\frac{3 (2 c^{4} + 2 \cdot - 3 (c \cdot c^{2}) + 2 c^{2} \cdot 9 - c \cdot c^{2} - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.3.2

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

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Step 11.3.3.2.1

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

$\frac{3 (2 c^{4} + 2 \cdot - 3 (c^{1} c^{2}) + 2 c^{2} \cdot 9 - c \cdot c^{2} - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.3.2.2

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

$\frac{3 (2 c^{4} + 2 \cdot - 3 c^{1 + 2} + 2 c^{2} \cdot 9 - c \cdot c^{2} - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.3.3

Add $1$ and $2$ .

$\frac{3 (2 c^{4} + 2 \cdot - 3 c^{3} + 2 c^{2} \cdot 9 - c \cdot c^{2} - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.4

Multiply $2$ by $- 3$ .

$\frac{3 (2 c^{4} - 6 c^{3} + 2 c^{2} \cdot 9 - c \cdot c^{2} - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.5

Multiply $9$ by $2$ .

$\frac{3 (2 c^{4} - 6 c^{3} + 18 c^{2} - c \cdot c^{2} - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.6

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

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Step 11.3.6.1

Move $c^{2}$ .

$\frac{3 (2 c^{4} - 6 c^{3} + 18 c^{2} - (c^{2} c) - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.6.2

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

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Step 11.3.6.2.1

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

$\frac{3 (2 c^{4} - 6 c^{3} + 18 c^{2} - (c^{2} c^{1}) - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.6.2.2

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

$\frac{3 (2 c^{4} - 6 c^{3} + 18 c^{2} - c^{2 + 1} - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.6.3

Add $2$ and $1$ .

$\frac{3 (2 c^{4} - 6 c^{3} + 18 c^{2} - c^{3} - c (- 3 c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.7

Rewrite using the commutative property of multiplication.

$\frac{3 (2 c^{4} - 6 c^{3} + 18 c^{2} - c^{3} - 1 \cdot - 3 c \cdot c - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.8

Multiply $c$ by $c$ by adding the exponents.

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Step 11.3.8.1

Move $c$ .

$\frac{3 (2 c^{4} - 6 c^{3} + 18 c^{2} - c^{3} - 1 \cdot - 3 (c \cdot c) - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.8.2

Multiply $c$ by $c$ .

$\frac{3 (2 c^{4} - 6 c^{3} + 18 c^{2} - c^{3} - 1 \cdot - 3 c^{2} - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.9

Multiply $- 1$ by $- 3$ .

$\frac{3 (2 c^{4} - 6 c^{3} + 18 c^{2} - c^{3} + 3 c^{2} - c \cdot 9 + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.10

Multiply $9$ by $- 1$ .

$\frac{3 (2 c^{4} - 6 c^{3} + 18 c^{2} - c^{3} + 3 c^{2} - 9 c + 21 c^{2} + 21 (- 3 c) + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.11

Multiply $- 3$ by $21$ .

$\frac{3 (2 c^{4} - 6 c^{3} + 18 c^{2} - c^{3} + 3 c^{2} - 9 c + 21 c^{2} - 63 c + 21 \cdot 9 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.3.12

Multiply $21$ by $9$ .

$\frac{3 (2 c^{4} - 6 c^{3} + 18 c^{2} - c^{3} + 3 c^{2} - 9 c + 21 c^{2} - 63 c + 189 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.4

Subtract $c^{3}$ from $- 6 c^{3}$ .

$\frac{3 (2 c^{4} - 7 c^{3} + 18 c^{2} + 3 c^{2} - 9 c + 21 c^{2} - 63 c + 189 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.5

Add $18 c^{2}$ and $3 c^{2}$ .

$\frac{3 (2 c^{4} - 7 c^{3} + 21 c^{2} - 9 c + 21 c^{2} - 63 c + 189 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.6

Add $21 c^{2}$ and $21 c^{2}$ .

$\frac{3 (2 c^{4} - 7 c^{3} + 42 c^{2} - 9 c - 63 c + 189 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.7

Subtract $63 c$ from $- 9 c$ .

$\frac{3 (2 c^{4} - 7 c^{3} + 42 c^{2} - 72 c + 189 - 54 (c^{2} - c + 9))}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.8

Apply the distributive property.

$\frac{3 (2 c^{4} - 7 c^{3} + 42 c^{2} - 72 c + 189 - 54 c^{2} - 54 (- c) - 54 \cdot 9)}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.9

Simplify.

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Step 11.9.1

Multiply $- 1$ by $- 54$ .

$\frac{3 (2 c^{4} - 7 c^{3} + 42 c^{2} - 72 c + 189 - 54 c^{2} + 54 c - 54 \cdot 9)}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.9.2

Multiply $- 54$ by $9$ .

$\frac{3 (2 c^{4} - 7 c^{3} + 42 c^{2} - 72 c + 189 - 54 c^{2} + 54 c - 486)}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.10

Subtract $54 c^{2}$ from $42 c^{2}$ .

$\frac{3 (2 c^{4} - 7 c^{3} - 12 c^{2} - 72 c + 189 + 54 c - 486)}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.11

Add $- 72 c$ and $54 c$ .

$\frac{3 (2 c^{4} - 7 c^{3} - 12 c^{2} - 18 c + 189 - 486)}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$

Step 11.12

Subtract $486$ from $189$ .

$\frac{3 (2 c^{4} - 7 c^{3} - 12 c^{2} - 18 c - 297)}{(c + 3) (c^{2} - 3 c + 9) (c^{2} - c + 9)}$