Algebra Examples

${(t + \frac{1}{t})}^{4}$

Step 1

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

$\sum_{k = 0}^{4} \frac{4!}{(4 - k)! k!} \cdot {(t)}^{4 - k} \cdot {(\frac{1}{t})}^{k}$

Step 2

Expand the summation.

$\frac{4!}{(4 - 0)! 0!} {(t)}^{4 - 0} \cdot {(\frac{1}{t})}^{0} + \frac{4!}{(4 - 1)! 1!} {(t)}^{4 - 1} \cdot {(\frac{1}{t})}^{1} + \frac{4!}{(4 - 2)! 2!} {(t)}^{4 - 2} \cdot {(\frac{1}{t})}^{2} + \frac{4!}{(4 - 3)! 3!} {(t)}^{4 - 3} \cdot {(\frac{1}{t})}^{3} + \frac{4!}{(4 - 4)! 4!} {(t)}^{4 - 4} \cdot {(\frac{1}{t})}^{4}$

Step 3

Simplify the exponents for each term of the expansion.

$1 \cdot {(t)}^{4} \cdot {(\frac{1}{t})}^{0} + 4 \cdot {(t)}^{3} \cdot {(\frac{1}{t})}^{1} + 6 \cdot {(t)}^{2} \cdot {(\frac{1}{t})}^{2} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4

Simplify each term.

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Step 4.1

Multiply ${(t)}^{4}$ by $1$ .

${(t)}^{4} \cdot {(\frac{1}{t})}^{0} + 4 \cdot {(t)}^{3} \cdot {(\frac{1}{t})}^{1} + 6 \cdot {(t)}^{2} \cdot {(\frac{1}{t})}^{2} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.2

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

$t^{4} \cdot \frac{1^{0}}{t^{0}} + 4 \cdot {(t)}^{3} \cdot {(\frac{1}{t})}^{1} + 6 \cdot {(t)}^{2} \cdot {(\frac{1}{t})}^{2} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.3

Anything raised to $0$ is $1$ .

$t^{4} \cdot \frac{1}{t^{0}} + 4 \cdot {(t)}^{3} \cdot {(\frac{1}{t})}^{1} + 6 \cdot {(t)}^{2} \cdot {(\frac{1}{t})}^{2} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.4

Anything raised to $0$ is $1$ .

$t^{4} \cdot \frac{1}{1} + 4 \cdot {(t)}^{3} \cdot {(\frac{1}{t})}^{1} + 6 \cdot {(t)}^{2} \cdot {(\frac{1}{t})}^{2} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.5

Divide $1$ by $1$ .

$t^{4} \cdot 1 + 4 \cdot {(t)}^{3} \cdot {(\frac{1}{t})}^{1} + 6 \cdot {(t)}^{2} \cdot {(\frac{1}{t})}^{2} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.6

Multiply $t^{4}$ by $1$ .

$t^{4} + 4 \cdot {(t)}^{3} \cdot {(\frac{1}{t})}^{1} + 6 \cdot {(t)}^{2} \cdot {(\frac{1}{t})}^{2} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.7

Simplify.

$t^{4} + 4 t^{3} \cdot \frac{1}{t} + 6 \cdot {(t)}^{2} \cdot {(\frac{1}{t})}^{2} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.8

Cancel the common factor of $t$ .

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Step 4.8.1

Factor $t$ out of $4 t^{3}$ .

$t^{4} + t (4 t^{2}) \cdot \frac{1}{t} + 6 \cdot {(t)}^{2} \cdot {(\frac{1}{t})}^{2} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.8.2

Cancel the common factor.

$t^{4} + t (4 t^{2}) \cdot \frac{1}{t} + 6 \cdot {(t)}^{2} \cdot {(\frac{1}{t})}^{2} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.8.3

Rewrite the expression.

$t^{4} + 4 t^{2} + 6 \cdot {(t)}^{2} \cdot {(\frac{1}{t})}^{2} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.9

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

$t^{4} + 4 t^{2} + 6 t^{2} \cdot \frac{1^{2}}{t^{2}} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.10

One to any power is one.

$t^{4} + 4 t^{2} + 6 t^{2} \cdot \frac{1}{t^{2}} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.11

Cancel the common factor of $t^{2}$ .

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Step 4.11.1

Factor $t^{2}$ out of $6 t^{2}$ .

$t^{4} + 4 t^{2} + t^{2} \cdot 6 \cdot \frac{1}{t^{2}} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.11.2

Cancel the common factor.

$t^{4} + 4 t^{2} + t^{2} \cdot 6 \cdot \frac{1}{t^{2}} + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.11.3

Rewrite the expression.

$t^{4} + 4 t^{2} + 6 + 4 \cdot {(t)}^{1} \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.12

Simplify.

$t^{4} + 4 t^{2} + 6 + 4 \cdot t \cdot {(\frac{1}{t})}^{3} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.13

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

$t^{4} + 4 t^{2} + 6 + 4 t \cdot \frac{1^{3}}{t^{3}} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.14

One to any power is one.

$t^{4} + 4 t^{2} + 6 + 4 t \cdot \frac{1}{t^{3}} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.15

Cancel the common factor of $t$ .

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Step 4.15.1

Factor $t$ out of $4 t$ .

$t^{4} + 4 t^{2} + 6 + t \cdot 4 \cdot \frac{1}{t^{3}} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.15.2

Factor $t$ out of $t^{3}$ .

$t^{4} + 4 t^{2} + 6 + t \cdot 4 \cdot \frac{1}{t \cdot t^{2}} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.15.3

Cancel the common factor.

$t^{4} + 4 t^{2} + 6 + t \cdot 4 \cdot \frac{1}{t \cdot t^{2}} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.15.4

Rewrite the expression.

$t^{4} + 4 t^{2} + 6 + 4 \cdot \frac{1}{t^{2}} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.16

Combine $4$ and $\frac{1}{t^{2}}$ .

$t^{4} + 4 t^{2} + 6 + \frac{4}{t^{2}} + 1 \cdot {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.17

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

$t^{4} + 4 t^{2} + 6 + \frac{4}{t^{2}} + {(t)}^{0} \cdot {(\frac{1}{t})}^{4}$

Step 4.18

Anything raised to $0$ is $1$ .

$t^{4} + 4 t^{2} + 6 + \frac{4}{t^{2}} + 1 \cdot {(\frac{1}{t})}^{4}$

Step 4.19

Multiply ${(\frac{1}{t})}^{4}$ by $1$ .

$t^{4} + 4 t^{2} + 6 + \frac{4}{t^{2}} + {(\frac{1}{t})}^{4}$

Step 4.20

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

$t^{4} + 4 t^{2} + 6 + \frac{4}{t^{2}} + \frac{1^{4}}{t^{4}}$

Step 4.21

One to any power is one.

$t^{4} + 4 t^{2} + 6 + \frac{4}{t^{2}} + \frac{1}{t^{4}}$