Algebra Examples

{(a + b)}^{6}

${(a + b)}^{6}$

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

$1 - 3 - 3 - 1$

1 - 4 - 6 - 4 - 1

$1 - 4 - 6 - 4 - 1$

1 - 5 - 10 - 10 - 5 - 1

$1 - 5 - 10 - 10 - 5 - 1$

1 - 6 - 15 - 20 - 15 - 6 - 1

$1 - 6 - 15 - 20 - 15 - 6 - 1$

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

{(a + b)}^{6}

${(a + b)}^{6}$ ,

n = 6

$n = 6$ so the coefficients of the expansion will correspond with line

7

$7$ .

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 - 6 - 15 - 20 - 15 - 6 - 1

$1 - 6 - 15 - 20 - 15 - 6 - 1$ .

1 a^{6} b^{0} + 6 a^{5} b + 15 a^{4} b^{2} + 20 a^{3} b^{3} + 15 a^{2} b^{4} + 6 a b^{5} + 1 a^{0} b^{6}

$1 a^{6} b^{0} + 6 a^{5} b + 15 a^{4} b^{2} + 20 a^{3} b^{3} + 15 a^{2} b^{4} + 6 a b^{5} + 1 a^{0} b^{6}$

Step 3

Substitute the actual values of

a

$a$

a

$a$ and

b

$b$

b

$b$ into the expression.

1 {(a)}^{6} {(b)}^{0} + 6 {(a)}^{5} {(b)}^{1} + 15 {(a)}^{4} {(b)}^{2} + 20 {(a)}^{3} {(b)}^{3} + 15 {(a)}^{2} {(b)}^{4} + 6 {(a)}^{1} {(b)}^{5} + 1 {(a)}^{0} {(b)}^{6}

$1 {(a)}^{6} {(b)}^{0} + 6 {(a)}^{5} {(b)}^{1} + 15 {(a)}^{4} {(b)}^{2} + 20 {(a)}^{3} {(b)}^{3} + 15 {(a)}^{2} {(b)}^{4} + 6 {(a)}^{1} {(b)}^{5} + 1 {(a)}^{0} {(b)}^{6}$

Step 4

Simplify each term.

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Step 4.1

Multiply

{(a)}^{6}

${(a)}^{6}$ by

1

$1$ .

{(a)}^{6} {(b)}^{0} + 6 {(a)}^{5} {(b)}^{1} + 15 {(a)}^{4} {(b)}^{2} + 20 {(a)}^{3} {(b)}^{3} + 15 {(a)}^{2} {(b)}^{4} + 6 {(a)}^{1} {(b)}^{5} + 1 {(a)}^{0} {(b)}^{6}

${(a)}^{6} {(b)}^{0} + 6 {(a)}^{5} {(b)}^{1} + 15 {(a)}^{4} {(b)}^{2} + 20 {(a)}^{3} {(b)}^{3} + 15 {(a)}^{2} {(b)}^{4} + 6 {(a)}^{1} {(b)}^{5} + 1 {(a)}^{0} {(b)}^{6}$

Step 4.2

Anything raised to

0

$0$ is

1

$1$ .

a^{6} \cdot 1 + 6 {(a)}^{5} {(b)}^{1} + 15 {(a)}^{4} {(b)}^{2} + 20 {(a)}^{3} {(b)}^{3} + 15 {(a)}^{2} {(b)}^{4} + 6 {(a)}^{1} {(b)}^{5} + 1 {(a)}^{0} {(b)}^{6}

$a^{6} \cdot 1 + 6 {(a)}^{5} {(b)}^{1} + 15 {(a)}^{4} {(b)}^{2} + 20 {(a)}^{3} {(b)}^{3} + 15 {(a)}^{2} {(b)}^{4} + 6 {(a)}^{1} {(b)}^{5} + 1 {(a)}^{0} {(b)}^{6}$

Step 4.3

Multiply

a^{6}

$a^{6}$ by

1

$1$ .

a^{6} + 6 {(a)}^{5} {(b)}^{1} + 15 {(a)}^{4} {(b)}^{2} + 20 {(a)}^{3} {(b)}^{3} + 15 {(a)}^{2} {(b)}^{4} + 6 {(a)}^{1} {(b)}^{5} + 1 {(a)}^{0} {(b)}^{6}

$a^{6} + 6 {(a)}^{5} {(b)}^{1} + 15 {(a)}^{4} {(b)}^{2} + 20 {(a)}^{3} {(b)}^{3} + 15 {(a)}^{2} {(b)}^{4} + 6 {(a)}^{1} {(b)}^{5} + 1 {(a)}^{0} {(b)}^{6}$

Step 4.4

Simplify.

a^{6} + 6 a^{5} b + 15 {(a)}^{4} {(b)}^{2} + 20 {(a)}^{3} {(b)}^{3} + 15 {(a)}^{2} {(b)}^{4} + 6 {(a)}^{1} {(b)}^{5} + 1 {(a)}^{0} {(b)}^{6}

$a^{6} + 6 a^{5} b + 15 {(a)}^{4} {(b)}^{2} + 20 {(a)}^{3} {(b)}^{3} + 15 {(a)}^{2} {(b)}^{4} + 6 {(a)}^{1} {(b)}^{5} + 1 {(a)}^{0} {(b)}^{6}$

Step 4.5

Simplify.

a^{6} + 6 a^{5} b + 15 a^{4} b^{2} + 20 a^{3} b^{3} + 15 a^{2} b^{4} + 6 a {(b)}^{5} + 1 {(a)}^{0} {(b)}^{6}

$a^{6} + 6 a^{5} b + 15 a^{4} b^{2} + 20 a^{3} b^{3} + 15 a^{2} b^{4} + 6 a {(b)}^{5} + 1 {(a)}^{0} {(b)}^{6}$

Step 4.6

Multiply

{(a)}^{0}

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

1

$1$ .

a^{6} + 6 a^{5} b + 15 a^{4} b^{2} + 20 a^{3} b^{3} + 15 a^{2} b^{4} + 6 a b^{5} + {(a)}^{0} {(b)}^{6}

$a^{6} + 6 a^{5} b + 15 a^{4} b^{2} + 20 a^{3} b^{3} + 15 a^{2} b^{4} + 6 a b^{5} + {(a)}^{0} {(b)}^{6}$

Step 4.7

Anything raised to

0

$0$ is

1

$1$ .

a^{6} + 6 a^{5} b + 15 a^{4} b^{2} + 20 a^{3} b^{3} + 15 a^{2} b^{4} + 6 a b^{5} + 1 {(b)}^{6}

$a^{6} + 6 a^{5} b + 15 a^{4} b^{2} + 20 a^{3} b^{3} + 15 a^{2} b^{4} + 6 a b^{5} + 1 {(b)}^{6}$

Step 4.8

Multiply

{(b)}^{6}

${(b)}^{6}$ by

1

$1$ .

a^{6} + 6 a^{5} b + 15 a^{4} b^{2} + 20 a^{3} b^{3} + 15 a^{2} b^{4} + 6 a b^{5} + b^{6}

$a^{6} + 6 a^{5} b + 15 a^{4} b^{2} + 20 a^{3} b^{3} + 15 a^{2} b^{4} + 6 a b^{5} + b^{6}$

a^{6} + 6 a^{5} b + 15 a^{4} b^{2} + 20 a^{3} b^{3} + 15 a^{2} b^{4} + 6 a b^{5} + b^{6}

$a^{6} + 6 a^{5} b + 15 a^{4} b^{2} + 20 a^{3} b^{3} + 15 a^{2} b^{4} + 6 a b^{5} + b^{6}$