Expand Using the Binomial Theorem (9n-4/7z)^2

${(9 n - \frac{4}{7} z)}^{2}$

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

$\sum_{k = 0}^{2} \frac{2!}{(2 - k)! k!} \cdot {(9 n)}^{2 - k} \cdot {(- \frac{4}{7} z)}^{k}$

Expand the summation.

$\frac{2!}{(2 - 0)! 0!} \cdot {(9 n)}^{2 - 0} \cdot {(- \frac{4}{7} z)}^{0} + \frac{2!}{(2 - 1)! 1!} \cdot {(9 n)}^{2 - 1} \cdot {(- \frac{4}{7} z)}^{1} + \frac{2!}{(2 - 2)! 2!} \cdot {(9 n)}^{2 - 2} \cdot {(- \frac{4}{7} z)}^{2}$

Simplify the exponents for each term of the expansion.

$1 \cdot {(9 n)}^{2} \cdot {(- \frac{4}{7} z)}^{0} + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Simplify each term.

Multiply ${(9 n)}^{2}$ by $1$ .

${(9 n)}^{2} \cdot {(- \frac{4}{7} z)}^{0} + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Apply the product rule to $9 n$ .

$9^{2} n^{2} \cdot {(- \frac{4}{7} z)}^{0} + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Raise $9$ to the power of $2$ .

$81 n^{2} \cdot {(- \frac{4}{7} z)}^{0} + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Combine $z$ and $\frac{4}{7}$ .

$81 n^{2} \cdot {(- \frac{z \cdot 4}{7})}^{0} + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Move $4$ to the left of $z$ .

$81 n^{2} \cdot {(- \frac{4 \cdot z}{7})}^{0} + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

Apply the product rule to $- \frac{4 z}{7}$ .

$81 n^{2} \cdot ({(- 1)}^{0} {(\frac{4 z}{7})}^{0}) + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Apply the product rule to $\frac{4 z}{7}$ .

$81 n^{2} \cdot ({(- 1)}^{0} \frac{{(4 z)}^{0}}{7^{0}}) + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Apply the product rule to $4 z$ .

$81 n^{2} \cdot ({(- 1)}^{0} \frac{4^{0} z^{0}}{7^{0}}) + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Anything raised to $0$ is $1$ .

$81 n^{2} \cdot (1 \frac{4^{0} z^{0}}{7^{0}}) + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Multiply $\frac{4^{0} z^{0}}{7^{0}}$ by $1$ .

$81 n^{2} \cdot \frac{4^{0} z^{0}}{7^{0}} + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Simplify the numerator.

Anything raised to $0$ is $1$ .

$81 n^{2} \cdot \frac{1 z^{0}}{7^{0}} + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Anything raised to $0$ is $1$ .

$81 n^{2} \cdot \frac{1 \cdot 1}{7^{0}} + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Multiply $1$ by $1$ .

$81 n^{2} \cdot \frac{1}{7^{0}} + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Anything raised to $0$ is $1$ .

$81 n^{2} \cdot \frac{1}{1} + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Divide $1$ by $1$ .

$81 n^{2} \cdot 1 + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Multiply $81$ by $1$ .

$81 n^{2} + 2 \cdot {(9 n)}^{1} \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Simplify.

$81 n^{2} + 2 \cdot (9 n) \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Multiply $9$ by $2$ .

$81 n^{2} + 18 n \cdot {(- \frac{4}{7} z)}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Combine $z$ and $\frac{4}{7}$ .

$81 n^{2} + 18 n \cdot {(- \frac{z \cdot 4}{7})}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Move $4$ to the left of $z$ .

$81 n^{2} + 18 n \cdot {(- \frac{4 \cdot z}{7})}^{1} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Multiply $18 n (- \frac{4 z}{7})$ .

Multiply $- 1$ by $18$ .

$81 n^{2} - 18 n \frac{4 z}{7} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Combine $- 18$ and $\frac{4 z}{7}$ .

$81 n^{2} + n \frac{- 18 (4 z)}{7} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Multiply $4$ by $- 18$ .

$81 n^{2} + n \frac{- 72 z}{7} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Combine $n$ and $\frac{- 72 z}{7}$ .

$81 n^{2} + \frac{n (- 72 z)}{7} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Remove unnecessary parentheses.

$81 n^{2} + \frac{n \cdot - 72 z}{7} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Move $- 72$ to the left of $n$ .

$81 n^{2} + \frac{- 72 \cdot n z}{7} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Move the negative in front of the fraction.

$81 n^{2} - \frac{(72) \cdot n z}{7} + 1 \cdot {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Multiply ${(9 n)}^{0}$ by $1$ .

$81 n^{2} - \frac{72 n z}{7} + {(9 n)}^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Apply the product rule to $9 n$ .

$81 n^{2} - \frac{72 n z}{7} + 9^{0} n^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Anything raised to $0$ is $1$ .

$81 n^{2} - \frac{72 n z}{7} + 1 n^{0} \cdot {(- \frac{4}{7} z)}^{2}$

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

$81 n^{2} - \frac{72 n z}{7} + n^{0} \cdot {(- \frac{4}{7} z)}^{2}$

Anything raised to $0$ is $1$ .

$81 n^{2} - \frac{72 n z}{7} + 1 \cdot {(- \frac{4}{7} z)}^{2}$

Multiply ${(- \frac{4}{7} z)}^{2}$ by $1$ .

$81 n^{2} - \frac{72 n z}{7} + {(- \frac{4}{7} z)}^{2}$

Combine $z$ and $\frac{4}{7}$ .

$81 n^{2} - \frac{72 n z}{7} + {(- \frac{z \cdot 4}{7})}^{2}$

Move $4$ to the left of $z$ .

$81 n^{2} - \frac{72 n z}{7} + {(- \frac{4 \cdot z}{7})}^{2}$

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

Apply the product rule to $- \frac{4 z}{7}$ .

$81 n^{2} - \frac{72 n z}{7} + {(- 1)}^{2} {(\frac{4 z}{7})}^{2}$

Apply the product rule to $\frac{4 z}{7}$ .

$81 n^{2} - \frac{72 n z}{7} + {(- 1)}^{2} \frac{{(4 z)}^{2}}{7^{2}}$

Apply the product rule to $4 z$ .

$81 n^{2} - \frac{72 n z}{7} + {(- 1)}^{2} \frac{4^{2} z^{2}}{7^{2}}$

Raise $- 1$ to the power of $2$ .

$81 n^{2} - \frac{72 n z}{7} + 1 \frac{4^{2} z^{2}}{7^{2}}$

Multiply $\frac{4^{2} z^{2}}{7^{2}}$ by $1$ .

$81 n^{2} - \frac{72 n z}{7} + \frac{4^{2} z^{2}}{7^{2}}$

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

$81 n^{2} - \frac{72 n z}{7} + \frac{16 z^{2}}{7^{2}}$

Raise $7$ to the power of $2$ .

$81 n^{2} - \frac{72 n z}{7} + \frac{16 z^{2}}{49}$

Expand Using the Binomial Theorem (9n-4/7z)^2

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