Trigonometry Examples

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

Step 1

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

$\sum_{k = 0}^{6} \frac{6!}{(6 - k)! k!} \cdot {(2)}^{6 - k} \cdot {(- x)}^{k}$

Step 2

Expand the summation.

$\frac{6!}{(6 - 0)! 0!} \cdot {(2)}^{6 - 0} \cdot {(- x)}^{0} + \frac{6!}{(6 - 1)! 1!} \cdot {(2)}^{6 - 1} \cdot {(- x)}^{1} + \dots + \frac{6!}{(6 - 6)! 6!} \cdot {(2)}^{6 - 6} \cdot {(- x)}^{6}$

Step 3

Simplify the exponents for each term of the expansion.

$1 \cdot {(2)}^{6} \cdot {(- x)}^{0} + 6 \cdot {(2)}^{5} \cdot {(- x)}^{1} + \dots + 1 \cdot {(2)}^{0} \cdot {(- x)}^{6}$

Step 4

Simplify the polynomial result.

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