Expand Using the Binomial Theorem (7x^2-4)^2

${(7 x^{2} - 4)}^{2}$

Step 1

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

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

Step 2

Expand the summation.

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

Step 3

Simplify the exponents for each term of the expansion.

$1 \cdot {(7 x^{2})}^{2} \cdot {(- 4)}^{0} + 2 \cdot {(7 x^{2})}^{1} \cdot {(- 4)}^{1} + 1 \cdot {(7 x^{2})}^{0} \cdot {(- 4)}^{2}$

Step 4

Simplify each term.

Multiply ${(7 x^{2})}^{2}$ by $1$ .

${(7 x^{2})}^{2} \cdot {(- 4)}^{0} + 2 \cdot {(7 x^{2})}^{1} \cdot {(- 4)}^{1} + 1 \cdot {(7 x^{2})}^{0} \cdot {(- 4)}^{2}$

Apply the product rule to $7 x^{2}$ .

$7^{2} {(x^{2})}^{2} \cdot {(- 4)}^{0} + 2 \cdot {(7 x^{2})}^{1} \cdot {(- 4)}^{1} + 1 \cdot {(7 x^{2})}^{0} \cdot {(- 4)}^{2}$

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

$49 {(x^{2})}^{2} \cdot {(- 4)}^{0} + 2 \cdot {(7 x^{2})}^{1} \cdot {(- 4)}^{1} + 1 \cdot {(7 x^{2})}^{0} \cdot {(- 4)}^{2}$

Multiply the exponents in ${(x^{2})}^{2}$ .

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$49 x^{2 \cdot 2} \cdot {(- 4)}^{0} + 2 \cdot {(7 x^{2})}^{1} \cdot {(- 4)}^{1} + 1 \cdot {(7 x^{2})}^{0} \cdot {(- 4)}^{2}$

Multiply $2$ by $2$ .

$49 x^{4} \cdot {(- 4)}^{0} + 2 \cdot {(7 x^{2})}^{1} \cdot {(- 4)}^{1} + 1 \cdot {(7 x^{2})}^{0} \cdot {(- 4)}^{2}$

Anything raised to $0$ is $1$ .

$49 x^{4} \cdot 1 + 2 \cdot {(7 x^{2})}^{1} \cdot {(- 4)}^{1} + 1 \cdot {(7 x^{2})}^{0} \cdot {(- 4)}^{2}$

Multiply $49$ by $1$ .

$49 x^{4} + 2 \cdot {(7 x^{2})}^{1} \cdot {(- 4)}^{1} + 1 \cdot {(7 x^{2})}^{0} \cdot {(- 4)}^{2}$

Simplify.

$49 x^{4} + 2 \cdot (7 x^{2}) \cdot {(- 4)}^{1} + 1 \cdot {(7 x^{2})}^{0} \cdot {(- 4)}^{2}$

Multiply $7$ by $2$ .

$49 x^{4} + 14 x^{2} \cdot {(- 4)}^{1} + 1 \cdot {(7 x^{2})}^{0} \cdot {(- 4)}^{2}$

Evaluate the exponent.

$49 x^{4} + 14 x^{2} \cdot - 4 + 1 \cdot {(7 x^{2})}^{0} \cdot {(- 4)}^{2}$

Multiply $- 4$ by $14$ .

$49 x^{4} - 56 x^{2} + 1 \cdot {(7 x^{2})}^{0} \cdot {(- 4)}^{2}$

Multiply ${(7 x^{2})}^{0}$ by $1$ .

$49 x^{4} - 56 x^{2} + {(7 x^{2})}^{0} \cdot {(- 4)}^{2}$

Apply the product rule to $7 x^{2}$ .

$49 x^{4} - 56 x^{2} + 7^{0} {(x^{2})}^{0} \cdot {(- 4)}^{2}$

Anything raised to $0$ is $1$ .

$49 x^{4} - 56 x^{2} + 1 {(x^{2})}^{0} \cdot {(- 4)}^{2}$

Multiply ${(x^{2})}^{0}$ by $1$ .

$49 x^{4} - 56 x^{2} + {(x^{2})}^{0} \cdot {(- 4)}^{2}$

Multiply the exponents in ${(x^{2})}^{0}$ .

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$49 x^{4} - 56 x^{2} + x^{2 \cdot 0} \cdot {(- 4)}^{2}$

Multiply $2$ by $0$ .

$49 x^{4} - 56 x^{2} + x^{0} \cdot {(- 4)}^{2}$

Anything raised to $0$ is $1$ .

$49 x^{4} - 56 x^{2} + 1 \cdot {(- 4)}^{2}$

Multiply ${(- 4)}^{2}$ by $1$ .

$49 x^{4} - 56 x^{2} + {(- 4)}^{2}$

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

$49 x^{4} - 56 x^{2} + 16$

Expand Using the Binomial Theorem (7x^2-4)^2

Related Questions

Support LCMGCF.com by disabling your adblocker.