Trigonometry Examples

$\frac{x^{2} - 23}{2 x^{5} - 5 x - 3} + \frac{- 1}{2 x + 1}$

Step 1

Move the negative in front of the fraction.

$\frac{x^{2} - 23}{2 x^{5} - 5 x - 3} - \frac{1}{2 x + 1}$

Step 2

To write $\frac{x^{2} - 23}{2 x^{5} - 5 x - 3}$ as a fraction with a common denominator, multiply by $\frac{2 x + 1}{2 x + 1}$ .

$\frac{x^{2} - 23}{2 x^{5} - 5 x - 3} \cdot \frac{2 x + 1}{2 x + 1} - \frac{1}{2 x + 1}$

Step 3

To write $- \frac{1}{2 x + 1}$ as a fraction with a common denominator, multiply by $\frac{2 x^{5} - 5 x - 3}{2 x^{5} - 5 x - 3}$ .

$\frac{x^{2} - 23}{2 x^{5} - 5 x - 3} \cdot \frac{2 x + 1}{2 x + 1} - \frac{1}{2 x + 1} \cdot \frac{2 x^{5} - 5 x - 3}{2 x^{5} - 5 x - 3}$

Step 4

Write each expression with a common denominator of $(2 x^{5} - 5 x - 3) (2 x + 1)$ , by multiplying each by an appropriate factor of $1$ .

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Step 4.1

Multiply $\frac{x^{2} - 23}{2 x^{5} - 5 x - 3}$ by $\frac{2 x + 1}{2 x + 1}$ .

$\frac{(x^{2} - 23) (2 x + 1)}{(2 x^{5} - 5 x - 3) (2 x + 1)} - \frac{1}{2 x + 1} \cdot \frac{2 x^{5} - 5 x - 3}{2 x^{5} - 5 x - 3}$

Step 4.2

Multiply $\frac{1}{2 x + 1}$ by $\frac{2 x^{5} - 5 x - 3}{2 x^{5} - 5 x - 3}$ .

$\frac{(x^{2} - 23) (2 x + 1)}{(2 x^{5} - 5 x - 3) (2 x + 1)} - \frac{2 x^{5} - 5 x - 3}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 4.3

Reorder the factors of $(2 x^{5} - 5 x - 3) (2 x + 1)$ .

$\frac{(x^{2} - 23) (2 x + 1)}{(2 x + 1) (2 x^{5} - 5 x - 3)} - \frac{2 x^{5} - 5 x - 3}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 5

Combine the numerators over the common denominator.

$\frac{(x^{2} - 23) (2 x + 1) - (2 x^{5} - 5 x - 3)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6

Simplify the numerator.

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Step 6.1

Expand $(x^{2} - 23) (2 x + 1)$ using the FOIL Method.

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Step 6.1.1

Apply the distributive property.

$\frac{x^{2} (2 x + 1) - 23 (2 x + 1) - (2 x^{5} - 5 x - 3)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.1.2

Apply the distributive property.

$\frac{x^{2} (2 x) + x^{2} \cdot 1 - 23 (2 x + 1) - (2 x^{5} - 5 x - 3)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.1.3

Apply the distributive property.

$\frac{x^{2} (2 x) + x^{2} \cdot 1 - 23 (2 x) - 23 \cdot 1 - (2 x^{5} - 5 x - 3)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.2

Simplify each term.

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Step 6.2.1

Rewrite using the commutative property of multiplication.

$\frac{2 x^{2} x + x^{2} \cdot 1 - 23 (2 x) - 23 \cdot 1 - (2 x^{5} - 5 x - 3)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.2.2

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

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Step 6.2.2.1

Move $x$ .

$\frac{2 (x \cdot x^{2}) + x^{2} \cdot 1 - 23 (2 x) - 23 \cdot 1 - (2 x^{5} - 5 x - 3)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.2.2.2

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

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Step 6.2.2.2.1

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

$\frac{2 (x^{1} x^{2}) + x^{2} \cdot 1 - 23 (2 x) - 23 \cdot 1 - (2 x^{5} - 5 x - 3)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.2.2.2.2

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

$\frac{2 x^{1 + 2} + x^{2} \cdot 1 - 23 (2 x) - 23 \cdot 1 - (2 x^{5} - 5 x - 3)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.2.2.3

Add $1$ and $2$ .

$\frac{2 x^{3} + x^{2} \cdot 1 - 23 (2 x) - 23 \cdot 1 - (2 x^{5} - 5 x - 3)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.2.3

Multiply $x^{2}$ by $1$ .

$\frac{2 x^{3} + x^{2} - 23 (2 x) - 23 \cdot 1 - (2 x^{5} - 5 x - 3)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.2.4

Multiply $2$ by $- 23$ .

$\frac{2 x^{3} + x^{2} - 46 x - 23 \cdot 1 - (2 x^{5} - 5 x - 3)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.2.5

Multiply $- 23$ by $1$ .

$\frac{2 x^{3} + x^{2} - 46 x - 23 - (2 x^{5} - 5 x - 3)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.3

Apply the distributive property.

$\frac{2 x^{3} + x^{2} - 46 x - 23 - (2 x^{5}) - (- 5 x) - - 3}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.4

Simplify.

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Step 6.4.1

Multiply $2$ by $- 1$ .

$\frac{2 x^{3} + x^{2} - 46 x - 23 - 2 x^{5} - (- 5 x) - - 3}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.4.2

Multiply $- 5$ by $- 1$ .

$\frac{2 x^{3} + x^{2} - 46 x - 23 - 2 x^{5} + 5 x - - 3}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.4.3

Multiply $- 1$ by $- 3$ .

$\frac{2 x^{3} + x^{2} - 46 x - 23 - 2 x^{5} + 5 x + 3}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.5

Add $- 46 x$ and $5 x$ .

$\frac{2 x^{3} + x^{2} - 41 x - 23 - 2 x^{5} + 3}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.6

Add $- 23$ and $3$ .

$\frac{2 x^{3} + x^{2} - 41 x - 2 x^{5} - 20}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 6.7

Reorder terms.

$\frac{- 2 x^{5} + 2 x^{3} + x^{2} - 41 x - 20}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 7

Simplify with factoring out.

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Step 7.1

Factor $- 1$ out of $- 2 x^{5}$ .

$\frac{- (2 x^{5}) + 2 x^{3} + x^{2} - 41 x - 20}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 7.2

Factor $- 1$ out of $2 x^{3}$ .

$\frac{- (2 x^{5}) - (- 2 x^{3}) + x^{2} - 41 x - 20}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 7.3

Factor $- 1$ out of $- (2 x^{5}) - (- 2 x^{3})$ .

$\frac{- (2 x^{5} - 2 x^{3}) + x^{2} - 41 x - 20}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 7.4

Factor $- 1$ out of $x^{2}$ .

$\frac{- (2 x^{5} - 2 x^{3}) - 1 (- x^{2}) - 41 x - 20}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 7.5

Factor $- 1$ out of $- (2 x^{5} - 2 x^{3}) - 1 (- x^{2})$ .

$\frac{- (2 x^{5} - 2 x^{3} - x^{2}) - 41 x - 20}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 7.6

Factor $- 1$ out of $- 41 x$ .

$\frac{- (2 x^{5} - 2 x^{3} - x^{2}) - (41 x) - 20}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 7.7

Factor $- 1$ out of $- (2 x^{5} - 2 x^{3} - x^{2}) - (41 x)$ .

$\frac{- (2 x^{5} - 2 x^{3} - x^{2} + 41 x) - 20}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 7.8

Rewrite $- 20$ as $- 1 (20)$ .

$\frac{- (2 x^{5} - 2 x^{3} - x^{2} + 41 x) - 1 (20)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 7.9

Factor $- 1$ out of $- (2 x^{5} - 2 x^{3} - x^{2} + 41 x) - 1 (20)$ .

$\frac{- (2 x^{5} - 2 x^{3} - x^{2} + 41 x + 20)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 7.10

Simplify the expression.

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Step 7.10.1

Rewrite $- (2 x^{5} - 2 x^{3} - x^{2} + 41 x + 20)$ as $- 1 (2 x^{5} - 2 x^{3} - x^{2} + 41 x + 20)$ .

$\frac{- 1 (2 x^{5} - 2 x^{3} - x^{2} + 41 x + 20)}{(2 x + 1) (2 x^{5} - 5 x - 3)}$

Step 7.10.2

Move the negative in front of the fraction.

$- \frac{2 x^{5} - 2 x^{3} - x^{2} + 41 x + 20}{(2 x + 1) (2 x^{5} - 5 x - 3)}$