Expand Using the Binomial Theorem (q+r)^3

${(q + r)}^{3}$

Step 1

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

$\sum_{k = 0}^{3} \frac{3!}{(3 - k)! k!} \cdot {(q)}^{3 - k} \cdot {(r)}^{k}$

Step 2

Expand the summation.

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

Step 3

Simplify the exponents for each term of the expansion.

$1 \cdot {(q)}^{3} \cdot {(r)}^{0} + 3 \cdot {(q)}^{2} \cdot {(r)}^{1} + 3 \cdot {(q)}^{1} \cdot {(r)}^{2} + 1 \cdot {(q)}^{0} \cdot {(r)}^{3}$

Step 4

Simplify each term.

Multiply ${(q)}^{3}$ by $1$ .

${(q)}^{3} \cdot {(r)}^{0} + 3 \cdot {(q)}^{2} \cdot {(r)}^{1} + 3 \cdot {(q)}^{1} \cdot {(r)}^{2} + 1 \cdot {(q)}^{0} \cdot {(r)}^{3}$

Anything raised to $0$ is $1$ .

$q^{3} \cdot 1 + 3 \cdot {(q)}^{2} \cdot {(r)}^{1} + 3 \cdot {(q)}^{1} \cdot {(r)}^{2} + 1 \cdot {(q)}^{0} \cdot {(r)}^{3}$

Multiply $q^{3}$ by $1$ .

$q^{3} + 3 \cdot {(q)}^{2} \cdot {(r)}^{1} + 3 \cdot {(q)}^{1} \cdot {(r)}^{2} + 1 \cdot {(q)}^{0} \cdot {(r)}^{3}$

Simplify.

$q^{3} + 3 q^{2} \cdot r + 3 \cdot {(q)}^{1} \cdot {(r)}^{2} + 1 \cdot {(q)}^{0} \cdot {(r)}^{3}$

Simplify.

$q^{3} + 3 q^{2} r + 3 \cdot q \cdot {(r)}^{2} + 1 \cdot {(q)}^{0} \cdot {(r)}^{3}$

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

$q^{3} + 3 q^{2} r + 3 q r^{2} + {(q)}^{0} \cdot {(r)}^{3}$

Anything raised to $0$ is $1$ .

$q^{3} + 3 q^{2} r + 3 q r^{2} + 1 \cdot {(r)}^{3}$

Multiply ${(r)}^{3}$ by $1$ .

$q^{3} + 3 q^{2} r + 3 q r^{2} + r^{3}$

Expand Using the Binomial Theorem (q+r)^3

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