Algebra Examples

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

Step 1

Use the binomial expansion theorem to find each term. The binomial theorem states ${(a + b)}^{n} = \sum_{k = 0}^{n} n C k \cdot (a^{n - k} b^{k})$ .

$\sum_{k = 0}^{3} \frac{3!}{(3 - k)! k!} \cdot {(x)}^{3 - k} \cdot {(\frac{1}{2})}^{k}$

Step 2

Expand the summation.

$\frac{3!}{(3 - 0)! 0!} {(x)}^{3 - 0} \cdot {(\frac{1}{2})}^{0} + \frac{3!}{(3 - 1)! 1!} {(x)}^{3 - 1} \cdot {(\frac{1}{2})}^{1} + \frac{3!}{(3 - 2)! 2!} {(x)}^{3 - 2} \cdot {(\frac{1}{2})}^{2} + \frac{3!}{(3 - 3)! 3!} {(x)}^{3 - 3} \cdot {(\frac{1}{2})}^{3}$

Step 3

Simplify the exponents for each term of the expansion.

$1 \cdot {(x)}^{3} \cdot {(\frac{1}{2})}^{0} + 3 \cdot {(x)}^{2} \cdot {(\frac{1}{2})}^{1} + 3 \cdot {(x)}^{1} \cdot {(\frac{1}{2})}^{2} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4

Simplify each term.

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Step 4.1

Multiply ${(x)}^{3}$ by $1$ .

${(x)}^{3} \cdot {(\frac{1}{2})}^{0} + 3 \cdot {(x)}^{2} \cdot {(\frac{1}{2})}^{1} + 3 \cdot {(x)}^{1} \cdot {(\frac{1}{2})}^{2} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.2

Apply the product rule to $\frac{1}{2}$ .

$x^{3} \cdot \frac{1^{0}}{2^{0}} + 3 \cdot {(x)}^{2} \cdot {(\frac{1}{2})}^{1} + 3 \cdot {(x)}^{1} \cdot {(\frac{1}{2})}^{2} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.3

Anything raised to $0$ is $1$ .

$x^{3} \cdot \frac{1}{2^{0}} + 3 \cdot {(x)}^{2} \cdot {(\frac{1}{2})}^{1} + 3 \cdot {(x)}^{1} \cdot {(\frac{1}{2})}^{2} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.4

Anything raised to $0$ is $1$ .

$x^{3} \cdot \frac{1}{1} + 3 \cdot {(x)}^{2} \cdot {(\frac{1}{2})}^{1} + 3 \cdot {(x)}^{1} \cdot {(\frac{1}{2})}^{2} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.5

Divide $1$ by $1$ .

$x^{3} \cdot 1 + 3 \cdot {(x)}^{2} \cdot {(\frac{1}{2})}^{1} + 3 \cdot {(x)}^{1} \cdot {(\frac{1}{2})}^{2} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.6

Multiply $x^{3}$ by $1$ .

$x^{3} + 3 \cdot {(x)}^{2} \cdot {(\frac{1}{2})}^{1} + 3 \cdot {(x)}^{1} \cdot {(\frac{1}{2})}^{2} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.7

Simplify.

$x^{3} + 3 x^{2} \cdot \frac{1}{2} + 3 \cdot {(x)}^{1} \cdot {(\frac{1}{2})}^{2} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.8

Multiply $3 x^{2} \frac{1}{2}$ .

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Step 4.8.1

Combine $3$ and $\frac{1}{2}$ .

$x^{3} + x^{2} \frac{3}{2} + 3 \cdot {(x)}^{1} \cdot {(\frac{1}{2})}^{2} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.8.2

Combine $x^{2}$ and $\frac{3}{2}$ .

$x^{3} + \frac{x^{2} \cdot 3}{2} + 3 \cdot {(x)}^{1} \cdot {(\frac{1}{2})}^{2} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.9

Move $3$ to the left of $x^{2}$ .

$x^{3} + \frac{3 \cdot x^{2}}{2} + 3 \cdot {(x)}^{1} \cdot {(\frac{1}{2})}^{2} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.10

Simplify.

$x^{3} + \frac{3 x^{2}}{2} + 3 \cdot x \cdot {(\frac{1}{2})}^{2} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.11

Apply the product rule to $\frac{1}{2}$ .

$x^{3} + \frac{3 x^{2}}{2} + 3 x \cdot \frac{1^{2}}{2^{2}} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.12

One to any power is one.

$x^{3} + \frac{3 x^{2}}{2} + 3 x \cdot \frac{1}{2^{2}} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.13

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

$x^{3} + \frac{3 x^{2}}{2} + 3 x \cdot \frac{1}{4} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.14

Multiply $3 x \frac{1}{4}$ .

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Step 4.14.1

Combine $3$ and $\frac{1}{4}$ .

$x^{3} + \frac{3 x^{2}}{2} + x \frac{3}{4} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.14.2

Combine $x$ and $\frac{3}{4}$ .

$x^{3} + \frac{3 x^{2}}{2} + \frac{x \cdot 3}{4} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.15

Move $3$ to the left of $x$ .

$x^{3} + \frac{3 x^{2}}{2} + \frac{3 \cdot x}{4} + 1 \cdot {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.16

Multiply ${(x)}^{0}$ by $1$ .

$x^{3} + \frac{3 x^{2}}{2} + \frac{3 x}{4} + {(x)}^{0} \cdot {(\frac{1}{2})}^{3}$

Step 4.17

Anything raised to $0$ is $1$ .

$x^{3} + \frac{3 x^{2}}{2} + \frac{3 x}{4} + 1 \cdot {(\frac{1}{2})}^{3}$

Step 4.18

Multiply ${(\frac{1}{2})}^{3}$ by $1$ .

$x^{3} + \frac{3 x^{2}}{2} + \frac{3 x}{4} + {(\frac{1}{2})}^{3}$

Step 4.19

Apply the product rule to $\frac{1}{2}$ .

$x^{3} + \frac{3 x^{2}}{2} + \frac{3 x}{4} + \frac{1^{3}}{2^{3}}$

Step 4.20

One to any power is one.

$x^{3} + \frac{3 x^{2}}{2} + \frac{3 x}{4} + \frac{1}{2^{3}}$

Step 4.21

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

$x^{3} + \frac{3 x^{2}}{2} + \frac{3 x}{4} + \frac{1}{8}$