Expand Using the Binomial Theorem (4u+1)^4

${(4 u + 1)}^{4}$

Step 1

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

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

Step 2

Expand the summation.

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

Step 3

Simplify the exponents for each term of the expansion.

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

Step 4

Simplify each term.

Multiply $1$ by ${(1)}^{0}$ by adding the exponents.

Move ${(1)}^{0}$ .

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

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

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

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

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

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

Add $0$ and $1$ .

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

Simplify $1^{1} \cdot {(4 u)}^{4}$ .

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

Apply the product rule to $4 u$ .

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

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

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

Apply the product rule to $4 u$ .

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

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

Move $4^{3}$ .

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

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

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

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

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

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

Add $3$ and $1$ .

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

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

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

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

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

Apply the product rule to $4 u$ .

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

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

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

Multiply $16$ by $6$ .

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

One to any power is one.

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

Multiply $96$ by $1$ .

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

Simplify.

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

Multiply $4$ by $4$ .

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

One to any power is one.

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

Multiply $16$ by $1$ .

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

Multiply $1$ by ${(1)}^{4}$ by adding the exponents.

Move ${(1)}^{4}$ .

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

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

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

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

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

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

Add $4$ and $1$ .

$256 u^{4} + 256 u^{3} + 96 u^{2} + 16 u + 1^{5} \cdot {(4 u)}^{0}$

Simplify $1^{5} \cdot {(4 u)}^{0}$ .

$256 u^{4} + 256 u^{3} + 96 u^{2} + 16 u + 1^{5}$

One to any power is one.

$256 u^{4} + 256 u^{3} + 96 u^{2} + 16 u + 1$

Expand Using the Binomial Theorem (4u+1)^4

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