Algebra Examples

${(4 r + t)}^{4}$

Step 1

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

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

Step 2

Expand the summation.

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

Step 3

Simplify the exponents for each term of the expansion.

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

Step 4

Simplify each term.

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Step 4.1

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

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

Step 4.2

Apply the product rule to $4 r$ .

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

Step 4.3

Raise $4$ to the power of $4$ .

$256 r^{4} \cdot {(t)}^{0} + 4 \cdot {(4 r)}^{3} \cdot {(t)}^{1} + 6 \cdot {(4 r)}^{2} \cdot {(t)}^{2} + 4 \cdot {(4 r)}^{1} \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.4

Anything raised to $0$ is $1$ .

$256 r^{4} \cdot 1 + 4 \cdot {(4 r)}^{3} \cdot {(t)}^{1} + 6 \cdot {(4 r)}^{2} \cdot {(t)}^{2} + 4 \cdot {(4 r)}^{1} \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.5

Multiply $256$ by $1$ .

$256 r^{4} + 4 \cdot {(4 r)}^{3} \cdot {(t)}^{1} + 6 \cdot {(4 r)}^{2} \cdot {(t)}^{2} + 4 \cdot {(4 r)}^{1} \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.6

Apply the product rule to $4 r$ .

$256 r^{4} + 4 \cdot (4^{3} r^{3}) \cdot {(t)}^{1} + 6 \cdot {(4 r)}^{2} \cdot {(t)}^{2} + 4 \cdot {(4 r)}^{1} \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.7

Multiply $4$ by $4^{3}$ by adding the exponents.

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Step 4.7.1

Move $4^{3}$ .

$256 r^{4} + 4^{3} \cdot 4 \cdot r^{3} \cdot {(t)}^{1} + 6 \cdot {(4 r)}^{2} \cdot {(t)}^{2} + 4 \cdot {(4 r)}^{1} \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.7.2

Multiply $4^{3}$ by $4$ .

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Step 4.7.2.1

Raise $4$ to the power of $1$ .

$256 r^{4} + 4^{3} \cdot 4^{1} \cdot r^{3} \cdot {(t)}^{1} + 6 \cdot {(4 r)}^{2} \cdot {(t)}^{2} + 4 \cdot {(4 r)}^{1} \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.7.2.2

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

$256 r^{4} + 4^{3 + 1} \cdot r^{3} \cdot {(t)}^{1} + 6 \cdot {(4 r)}^{2} \cdot {(t)}^{2} + 4 \cdot {(4 r)}^{1} \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.7.3

Add $3$ and $1$ .

$256 r^{4} + 4^{4} \cdot r^{3} \cdot {(t)}^{1} + 6 \cdot {(4 r)}^{2} \cdot {(t)}^{2} + 4 \cdot {(4 r)}^{1} \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.8

Simplify $4^{4} \cdot r^{3} \cdot {(t)}^{1}$ .

$256 r^{4} + 4^{4} \cdot r^{3} \cdot t + 6 \cdot {(4 r)}^{2} \cdot {(t)}^{2} + 4 \cdot {(4 r)}^{1} \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.9

Raise $4$ to the power of $4$ .

$256 r^{4} + 256 \cdot r^{3} \cdot t + 6 \cdot {(4 r)}^{2} \cdot {(t)}^{2} + 4 \cdot {(4 r)}^{1} \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.10

Apply the product rule to $4 r$ .

$256 r^{4} + 256 r^{3} t + 6 \cdot (4^{2} r^{2}) \cdot {(t)}^{2} + 4 \cdot {(4 r)}^{1} \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.11

Raise $4$ to the power of $2$ .

$256 r^{4} + 256 r^{3} t + 6 \cdot (16 r^{2}) \cdot {(t)}^{2} + 4 \cdot {(4 r)}^{1} \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.12

Multiply $16$ by $6$ .

$256 r^{4} + 256 r^{3} t + 96 r^{2} \cdot {(t)}^{2} + 4 \cdot {(4 r)}^{1} \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.13

Simplify.

$256 r^{4} + 256 r^{3} t + 96 r^{2} t^{2} + 4 \cdot (4 r) \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.14

Multiply $4$ by $4$ .

$256 r^{4} + 256 r^{3} t + 96 r^{2} t^{2} + 16 r \cdot {(t)}^{3} + 1 \cdot {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.15

Multiply ${(4 r)}^{0}$ by $1$ .

$256 r^{4} + 256 r^{3} t + 96 r^{2} t^{2} + 16 r t^{3} + {(4 r)}^{0} \cdot {(t)}^{4}$

Step 4.16

Apply the product rule to $4 r$ .

$256 r^{4} + 256 r^{3} t + 96 r^{2} t^{2} + 16 r t^{3} + 4^{0} r^{0} \cdot {(t)}^{4}$

Step 4.17

Anything raised to $0$ is $1$ .

$256 r^{4} + 256 r^{3} t + 96 r^{2} t^{2} + 16 r t^{3} + 1 r^{0} \cdot {(t)}^{4}$

Step 4.18

Multiply $r^{0}$ by $1$ .

$256 r^{4} + 256 r^{3} t + 96 r^{2} t^{2} + 16 r t^{3} + r^{0} \cdot {(t)}^{4}$

Step 4.19

Anything raised to $0$ is $1$ .

$256 r^{4} + 256 r^{3} t + 96 r^{2} t^{2} + 16 r t^{3} + 1 \cdot {(t)}^{4}$

Step 4.20

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

$256 r^{4} + 256 r^{3} t + 96 r^{2} t^{2} + 16 r t^{3} + t^{4}$