Algebra Examples

f (x) = 5 x - 1

$f (x) = 5 x - 1$ ,

g (x) = 2 x + 1

$g (x) = 2 x + 1$

Step 1

Replace the function designators with the actual functions in

f (x) \cdot (g (x))

$f (x) \cdot (g (x))$ .

(5 x - 1) \cdot (2 x + 1)

$(5 x - 1) \cdot (2 x + 1)$

Step 2

Simplify.

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Step 2.1

Expand

(5 x - 1) (2 x + 1)

$(5 x - 1) (2 x + 1)$ using the FOIL Method.

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Step 2.1.1

Apply the distributive property.

5 x (2 x + 1) - 1 (2 x + 1)

$5 x (2 x + 1) - 1 (2 x + 1)$

Step 2.1.2

Apply the distributive property.

5 x (2 x) + 5 x \cdot 1 - 1 (2 x + 1)

$5 x (2 x) + 5 x \cdot 1 - 1 (2 x + 1)$

Step 2.1.3

Apply the distributive property.

5 x (2 x) + 5 x \cdot 1 - 1 (2 x) - 1 \cdot 1

$5 x (2 x) + 5 x \cdot 1 - 1 (2 x) - 1 \cdot 1$

5 x (2 x) + 5 x \cdot 1 - 1 (2 x) - 1 \cdot 1

$5 x (2 x) + 5 x \cdot 1 - 1 (2 x) - 1 \cdot 1$

Step 2.2

Simplify and combine like terms.

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Step 2.2.1

Simplify each term.

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Step 2.2.1.1

Rewrite using the commutative property of multiplication.

5 \cdot 2 x \cdot x + 5 x \cdot 1 - 1 (2 x) - 1 \cdot 1

$5 \cdot 2 x \cdot x + 5 x \cdot 1 - 1 (2 x) - 1 \cdot 1$

Step 2.2.1.2

Multiply

x

$x$ by

x

$x$ by adding the exponents.

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Step 2.2.1.2.1

Move

x

$x$ .

5 \cdot 2 (x \cdot x) + 5 x \cdot 1 - 1 (2 x) - 1 \cdot 1

$5 \cdot 2 (x \cdot x) + 5 x \cdot 1 - 1 (2 x) - 1 \cdot 1$

Step 2.2.1.2.2

Multiply

x

$x$ by

x

$x$ .

5 \cdot 2 x^{2} + 5 x \cdot 1 - 1 (2 x) - 1 \cdot 1

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

5 \cdot 2 x^{2} + 5 x \cdot 1 - 1 (2 x) - 1 \cdot 1

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

Step 2.2.1.3

Multiply

5

$5$ by

2

$2$ .

10 x^{2} + 5 x \cdot 1 - 1 (2 x) - 1 \cdot 1

$10 x^{2} + 5 x \cdot 1 - 1 (2 x) - 1 \cdot 1$

Step 2.2.1.4

Multiply

5

$5$ by

1

$1$ .

10 x^{2} + 5 x - 1 (2 x) - 1 \cdot 1

$10 x^{2} + 5 x - 1 (2 x) - 1 \cdot 1$

Step 2.2.1.5

Multiply

2

$2$ by

- 1

$- 1$ .

10 x^{2} + 5 x - 2 x - 1 \cdot 1

$10 x^{2} + 5 x - 2 x - 1 \cdot 1$

Step 2.2.1.6

Multiply

- 1

$- 1$ by

1

$1$ .

10 x^{2} + 5 x - 2 x - 1

$10 x^{2} + 5 x - 2 x - 1$

10 x^{2} + 5 x - 2 x - 1

$10 x^{2} + 5 x - 2 x - 1$

Step 2.2.2

Subtract

2 x

$2 x$ from

5 x

$5 x$ .

10 x^{2} + 3 x - 1

$10 x^{2} + 3 x - 1$

10 x^{2} + 3 x - 1

$10 x^{2} + 3 x - 1$

10 x^{2} + 3 x - 1

$10 x^{2} + 3 x - 1$

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