Basic Math Examples

$\frac{9 y - 1}{c^{2} - 5 c - 24} - \frac{c - 6}{c^{2} - 9}$

Step 1

Simplify each term.

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Step 1.1

Factor $c^{2} - 5 c - 24$ using the AC method.

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Step 1.1.1

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 $- 24$ and whose sum is $- 5$ .

$- 8, 3$

Step 1.1.2

Write the factored form using these integers.

$\frac{9 y - 1}{(c - 8) (c + 3)} - \frac{c - 6}{c^{2} - 9}$

Step 1.2

Simplify the denominator.

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Step 1.2.1

Rewrite $9$ as $3^{2}$ .

$\frac{9 y - 1}{(c - 8) (c + 3)} - \frac{c - 6}{c^{2} - 3^{2}}$

Step 1.2.2

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

$\frac{9 y - 1}{(c - 8) (c + 3)} - \frac{c - 6}{(c + 3) (c - 3)}$

Step 2

To write $\frac{9 y - 1}{(c - 8) (c + 3)}$ as a fraction with a common denominator, multiply by $\frac{c - 3}{c - 3}$ .

$\frac{9 y - 1}{(c - 8) (c + 3)} \cdot \frac{c - 3}{c - 3} - \frac{c - 6}{(c + 3) (c - 3)}$

Step 3

To write $- \frac{c - 6}{(c + 3) (c - 3)}$ as a fraction with a common denominator, multiply by $\frac{c - 8}{c - 8}$ .

$\frac{9 y - 1}{(c - 8) (c + 3)} \cdot \frac{c - 3}{c - 3} - \frac{c - 6}{(c + 3) (c - 3)} \cdot \frac{c - 8}{c - 8}$

Step 4

Write each expression with a common denominator of $(c - 8) (c + 3) (c - 3)$ , by multiplying each by an appropriate factor of $1$ .

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Step 4.1

Multiply $\frac{9 y - 1}{(c - 8) (c + 3)}$ by $\frac{c - 3}{c - 3}$ .

$\frac{(9 y - 1) (c - 3)}{(c - 8) (c + 3) (c - 3)} - \frac{c - 6}{(c + 3) (c - 3)} \cdot \frac{c - 8}{c - 8}$

Step 4.2

Multiply $\frac{c - 6}{(c + 3) (c - 3)}$ by $\frac{c - 8}{c - 8}$ .

$\frac{(9 y - 1) (c - 3)}{(c - 8) (c + 3) (c - 3)} - \frac{(c - 6) (c - 8)}{(c + 3) (c - 3) (c - 8)}$

Step 4.3

Reorder the factors of $(c - 8) (c + 3) (c - 3)$ .

$\frac{(9 y - 1) (c - 3)}{(c + 3) (c - 3) (c - 8)} - \frac{(c - 6) (c - 8)}{(c + 3) (c - 3) (c - 8)}$

Step 5

Combine the numerators over the common denominator.

$\frac{(9 y - 1) (c - 3) - (c - 6) (c - 8)}{(c + 3) (c - 3) (c - 8)}$

Step 6

Simplify the numerator.

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Step 6.1

Expand $(9 y - 1) (c - 3)$ using the FOIL Method.

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Step 6.1.1

Apply the distributive property.

$\frac{9 y (c - 3) - 1 (c - 3) - (c - 6) (c - 8)}{(c + 3) (c - 3) (c - 8)}$

Step 6.1.2

Apply the distributive property.

$\frac{9 y c + 9 y \cdot - 3 - 1 (c - 3) - (c - 6) (c - 8)}{(c + 3) (c - 3) (c - 8)}$

Step 6.1.3

Apply the distributive property.

$\frac{9 y c + 9 y \cdot - 3 - 1 c - 1 \cdot - 3 - (c - 6) (c - 8)}{(c + 3) (c - 3) (c - 8)}$

Step 6.2

Simplify each term.

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Step 6.2.1

Multiply $- 3$ by $9$ .

$\frac{9 y c - 27 y - 1 c - 1 \cdot - 3 - (c - 6) (c - 8)}{(c + 3) (c - 3) (c - 8)}$

Step 6.2.2

Rewrite $- 1 c$ as $- c$ .

$\frac{9 y c - 27 y - c - 1 \cdot - 3 - (c - 6) (c - 8)}{(c + 3) (c - 3) (c - 8)}$

Step 6.2.3

Multiply $- 1$ by $- 3$ .

$\frac{9 y c - 27 y - c + 3 - (c - 6) (c - 8)}{(c + 3) (c - 3) (c - 8)}$

Step 6.3

Apply the distributive property.

$\frac{9 y c - 27 y - c + 3 + (- c - - 6) (c - 8)}{(c + 3) (c - 3) (c - 8)}$

Step 6.4

Multiply $- 1$ by $- 6$ .

$\frac{9 y c - 27 y - c + 3 + (- c + 6) (c - 8)}{(c + 3) (c - 3) (c - 8)}$

Step 6.5

Expand $(- c + 6) (c - 8)$ using the FOIL Method.

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Step 6.5.1

Apply the distributive property.

$\frac{9 y c - 27 y - c + 3 - c (c - 8) + 6 (c - 8)}{(c + 3) (c - 3) (c - 8)}$

Step 6.5.2

Apply the distributive property.

$\frac{9 y c - 27 y - c + 3 - c \cdot c - c \cdot - 8 + 6 (c - 8)}{(c + 3) (c - 3) (c - 8)}$

Step 6.5.3

Apply the distributive property.

$\frac{9 y c - 27 y - c + 3 - c \cdot c - c \cdot - 8 + 6 c + 6 \cdot - 8}{(c + 3) (c - 3) (c - 8)}$

Step 6.6

Simplify and combine like terms.

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Step 6.6.1

Simplify each term.

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Step 6.6.1.1

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

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Step 6.6.1.1.1

Move $c$ .

$\frac{9 y c - 27 y - c + 3 - (c \cdot c) - c \cdot - 8 + 6 c + 6 \cdot - 8}{(c + 3) (c - 3) (c - 8)}$

Step 6.6.1.1.2

Multiply $c$ by $c$ .

$\frac{9 y c - 27 y - c + 3 - c^{2} - c \cdot - 8 + 6 c + 6 \cdot - 8}{(c + 3) (c - 3) (c - 8)}$

Step 6.6.1.2

Multiply $- 8$ by $- 1$ .

$\frac{9 y c - 27 y - c + 3 - c^{2} + 8 c + 6 c + 6 \cdot - 8}{(c + 3) (c - 3) (c - 8)}$

Step 6.6.1.3

Multiply $6$ by $- 8$ .

$\frac{9 y c - 27 y - c + 3 - c^{2} + 8 c + 6 c - 48}{(c + 3) (c - 3) (c - 8)}$

Step 6.6.2

Add $8 c$ and $6 c$ .

$\frac{9 y c - 27 y - c + 3 - c^{2} + 14 c - 48}{(c + 3) (c - 3) (c - 8)}$

Step 6.7

Add $- c$ and $14 c$ .

$\frac{9 y c - 27 y + 13 c + 3 - c^{2} - 48}{(c + 3) (c - 3) (c - 8)}$

Step 6.8

Subtract $48$ from $3$ .

$\frac{9 y c - 27 y + 13 c - c^{2} - 45}{(c + 3) (c - 3) (c - 8)}$