Algebra Examples

${(x + 2)}^{6}$

Step 1

Pascal's Triangle can be displayed as such:

$1$

$1 - 1$

$1 - 2 - 1$

$1 - 3 - 3 - 1$

$1 - 4 - 6 - 4 - 1$

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

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

The triangle can be used to calculate the coefficients of the expansion of ${(a + b)}^{n}$ by taking the exponent $n$ and adding $1$ . The coefficients will correspond with line $n + 1$ of the triangle. For ${(x + 2)}^{6}$ , $n = 6$ so the coefficients of the expansion will correspond with line $7$ .

Step 2

The expansion follows the rule ${(a + b)}^{n} = c_{0} a^{n} b^{0} + c_{1} a^{n - 1} b^{1} + c_{n - 1} a^{1} b^{n - 1} + c_{n} a^{0} b^{n}$ . The values of the coefficients, from the triangle, are $1 - 6 - 15 - 20 - 15 - 6 - 1$ .

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

Step 3

Substitute the actual values of $a$ $x$ and $b$ $2$ into the expression.

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

Step 4

Simplify each term.

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Step 4.1

Multiply ${(x)}^{6}$ by $1$ .

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

Step 4.2

Anything raised to $0$ is $1$ .

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

Step 4.3

Multiply $x^{6}$ by $1$ .

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

Step 4.4

Evaluate the exponent.

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

Step 4.5

Multiply $2$ by $6$ .

$x^{6} + 12 x^{5} + 15 {(x)}^{4} {(2)}^{2} + 20 {(x)}^{3} {(2)}^{3} + 15 {(x)}^{2} {(2)}^{4} + 6 {(x)}^{1} {(2)}^{5} + 1 {(x)}^{0} {(2)}^{6}$

Step 4.6

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

$x^{6} + 12 x^{5} + 15 x^{4} \cdot 4 + 20 {(x)}^{3} {(2)}^{3} + 15 {(x)}^{2} {(2)}^{4} + 6 {(x)}^{1} {(2)}^{5} + 1 {(x)}^{0} {(2)}^{6}$

Step 4.7

Multiply $4$ by $15$ .

$x^{6} + 12 x^{5} + 60 x^{4} + 20 {(x)}^{3} {(2)}^{3} + 15 {(x)}^{2} {(2)}^{4} + 6 {(x)}^{1} {(2)}^{5} + 1 {(x)}^{0} {(2)}^{6}$

Step 4.8

Raise $2$ to the power of $3$ .

$x^{6} + 12 x^{5} + 60 x^{4} + 20 x^{3} \cdot 8 + 15 {(x)}^{2} {(2)}^{4} + 6 {(x)}^{1} {(2)}^{5} + 1 {(x)}^{0} {(2)}^{6}$

Step 4.9

Multiply $8$ by $20$ .

$x^{6} + 12 x^{5} + 60 x^{4} + 160 x^{3} + 15 {(x)}^{2} {(2)}^{4} + 6 {(x)}^{1} {(2)}^{5} + 1 {(x)}^{0} {(2)}^{6}$

Step 4.10

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

$x^{6} + 12 x^{5} + 60 x^{4} + 160 x^{3} + 15 x^{2} \cdot 16 + 6 {(x)}^{1} {(2)}^{5} + 1 {(x)}^{0} {(2)}^{6}$

Step 4.11

Multiply $16$ by $15$ .

$x^{6} + 12 x^{5} + 60 x^{4} + 160 x^{3} + 240 x^{2} + 6 {(x)}^{1} {(2)}^{5} + 1 {(x)}^{0} {(2)}^{6}$

Step 4.12

Simplify.

$x^{6} + 12 x^{5} + 60 x^{4} + 160 x^{3} + 240 x^{2} + 6 x {(2)}^{5} + 1 {(x)}^{0} {(2)}^{6}$

Step 4.13

Raise $2$ to the power of $5$ .

$x^{6} + 12 x^{5} + 60 x^{4} + 160 x^{3} + 240 x^{2} + 6 x \cdot 32 + 1 {(x)}^{0} {(2)}^{6}$

Step 4.14

Multiply $32$ by $6$ .

$x^{6} + 12 x^{5} + 60 x^{4} + 160 x^{3} + 240 x^{2} + 192 x + 1 {(x)}^{0} {(2)}^{6}$

Step 4.15

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

$x^{6} + 12 x^{5} + 60 x^{4} + 160 x^{3} + 240 x^{2} + 192 x + {(x)}^{0} {(2)}^{6}$

Step 4.16

Anything raised to $0$ is $1$ .

$x^{6} + 12 x^{5} + 60 x^{4} + 160 x^{3} + 240 x^{2} + 192 x + 1 {(2)}^{6}$

Step 4.17

Multiply ${(2)}^{6}$ by $1$ .

$x^{6} + 12 x^{5} + 60 x^{4} + 160 x^{3} + 240 x^{2} + 192 x + {(2)}^{6}$

Step 4.18

Raise $2$ to the power of $6$ .

$x^{6} + 12 x^{5} + 60 x^{4} + 160 x^{3} + 240 x^{2} + 192 x + 64$