Algebra Examples

{(v + w)}^{3}

${(v + w)}^{3}$

Step 1

Pascal's Triangle can be displayed as such:

1

$1$

1 - 1

$1 - 1$

1 - 2 - 1

$1 - 2 - 1$

1 - 3 - 3 - 1

$1 - 3 - 3 - 1$

The triangle can be used to calculate the coefficients of the expansion of

{(a + b)}^{n}

${(a + b)}^{n}$ by taking the exponent

n

$n$ and adding

1

$1$ . The coefficients will correspond with line

n + 1

$n + 1$ of the triangle. For

{(v + w)}^{3}

${(v + w)}^{3}$ ,

n = 3

$n = 3$ so the coefficients of the expansion will correspond with line

4

$4$ .

Step 2

The expansion follows the rule

{(a + b)}^{n} = c_{0} a^{n} b^{0} + c_{1} a^{n - 1} b^{1} + c_{n - 1} a^{1} b^{n - 1} + c_{n} a^{0} b^{n}

${(a + b)}^{n} = c_{0} a^{n} b^{0} + c_{1} a^{n - 1} b^{1} + c_{n - 1} a^{1} b^{n - 1} + c_{n} a^{0} b^{n}$ . The values of the coefficients, from the triangle, are

1 - 3 - 3 - 1

$1 - 3 - 3 - 1$ .

1 a^{3} b^{0} + 3 a^{2} b + 3 a b^{2} + 1 a^{0} b^{3}

$1 a^{3} b^{0} + 3 a^{2} b + 3 a b^{2} + 1 a^{0} b^{3}$

Step 3

Substitute the actual values of

a

$a$

v

$v$ and

b

$b$

w

$w$ into the expression.

1 {(v)}^{3} {(w)}^{0} + 3 {(v)}^{2} {(w)}^{1} + 3 {(v)}^{1} {(w)}^{2} + 1 {(v)}^{0} {(w)}^{3}

$1 {(v)}^{3} {(w)}^{0} + 3 {(v)}^{2} {(w)}^{1} + 3 {(v)}^{1} {(w)}^{2} + 1 {(v)}^{0} {(w)}^{3}$

Step 4

Simplify each term.

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Step 4.1

Multiply

{(v)}^{3}

${(v)}^{3}$ by

1

$1$ .

{(v)}^{3} {(w)}^{0} + 3 {(v)}^{2} {(w)}^{1} + 3 {(v)}^{1} {(w)}^{2} + 1 {(v)}^{0} {(w)}^{3}

${(v)}^{3} {(w)}^{0} + 3 {(v)}^{2} {(w)}^{1} + 3 {(v)}^{1} {(w)}^{2} + 1 {(v)}^{0} {(w)}^{3}$

Step 4.2

Anything raised to

0

$0$ is

1

$1$ .

v^{3} \cdot 1 + 3 {(v)}^{2} {(w)}^{1} + 3 {(v)}^{1} {(w)}^{2} + 1 {(v)}^{0} {(w)}^{3}

$v^{3} \cdot 1 + 3 {(v)}^{2} {(w)}^{1} + 3 {(v)}^{1} {(w)}^{2} + 1 {(v)}^{0} {(w)}^{3}$

Step 4.3

Multiply

v^{3}

$v^{3}$ by

1

$1$ .

v^{3} + 3 {(v)}^{2} {(w)}^{1} + 3 {(v)}^{1} {(w)}^{2} + 1 {(v)}^{0} {(w)}^{3}

$v^{3} + 3 {(v)}^{2} {(w)}^{1} + 3 {(v)}^{1} {(w)}^{2} + 1 {(v)}^{0} {(w)}^{3}$

Step 4.4

Simplify.

v^{3} + 3 v^{2} w + 3 {(v)}^{1} {(w)}^{2} + 1 {(v)}^{0} {(w)}^{3}

$v^{3} + 3 v^{2} w + 3 {(v)}^{1} {(w)}^{2} + 1 {(v)}^{0} {(w)}^{3}$

Step 4.5

Simplify.

v^{3} + 3 v^{2} w + 3 v {(w)}^{2} + 1 {(v)}^{0} {(w)}^{3}

$v^{3} + 3 v^{2} w + 3 v {(w)}^{2} + 1 {(v)}^{0} {(w)}^{3}$

Step 4.6

Multiply

{(v)}^{0}

${(v)}^{0}$ by

1

$1$ .

v^{3} + 3 v^{2} w + 3 v w^{2} + {(v)}^{0} {(w)}^{3}

$v^{3} + 3 v^{2} w + 3 v w^{2} + {(v)}^{0} {(w)}^{3}$

Step 4.7

Anything raised to

0

$0$ is

1

$1$ .

v^{3} + 3 v^{2} w + 3 v w^{2} + 1 {(w)}^{3}

$v^{3} + 3 v^{2} w + 3 v w^{2} + 1 {(w)}^{3}$

Step 4.8

Multiply

{(w)}^{3}

${(w)}^{3}$ by

1

$1$ .

v^{3} + 3 v^{2} w + 3 v w^{2} + w^{3}

$v^{3} + 3 v^{2} w + 3 v w^{2} + w^{3}$

v^{3} + 3 v^{2} w + 3 v w^{2} + w^{3}

$v^{3} + 3 v^{2} w + 3 v w^{2} + w^{3}$