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Popular Algebra >

expand (a+b)^{16}

Solution

expand

(a + b)^{16}

Solution

a^{16} + 16 a^{15} b + 120 a^{14} b^{2} + 560 a^{13} b^{3} + 1820 a^{12} b^{4} + 4368 a^{11} b^{5} + 8008 a^{10} b^{6} + 11440 a^{9} b^{7} + 12870 a^{8} b^{8} + 11440 a^{7} b^{9} + 8008 a^{6} b^{10} + 4368 a^{5} b^{11} + 1820 a^{4} b^{12} + 560 a^{3} b^{13} + 120 a^{2} b^{14} + 16 a b^{15} + b^{16}

Solution steps

(a + b)^{16}

Apply binomial theorem:

(a + b)^{n} = i = 0 \sum n (i n) a^{(n - i)} b^{i}

a = a, b = b

= i = 0 \sum 16 (i 16) a^{(16 - i)} b^{i}

Expand summation

= \frac{16 !}{0 ! ( 16 - 0 ) !} a^{16} b^{0} + \frac{16 !}{1 ! ( 16 - 1 ) !} a^{15} b^{1} + \frac{16 !}{2 ! ( 16 - 2 ) !} a^{14} b^{2} + \frac{16 !}{3 ! ( 16 - 3 ) !} a^{13} b^{3} + \frac{16 !}{4 ! ( 16 - 4 ) !} a^{12} b^{4} + \frac{16 !}{5 ! ( 16 - 5 ) !} a^{11} b^{5} + \frac{16 !}{6 ! ( 16 - 6 ) !} a^{10} b^{6} + \frac{16 !}{7 ! ( 16 - 7 ) !} a^{9} b^{7} + \frac{16 !}{8 ! ( 16 - 8 ) !} a^{8} b^{8} + \frac{16 !}{9 ! ( 16 - 9 ) !} a^{7} b^{9} + \frac{16 !}{10 ! ( 16 - 10 ) !} a^{6} b^{10} + \frac{16 !}{11 ! ( 16 - 11 ) !} a^{5} b^{11} + \frac{16 !}{12 ! ( 16 - 12 ) !} a^{4} b^{12} + \frac{16 !}{13 ! ( 16 - 13 ) !} a^{3} b^{13} + \frac{16 !}{14 ! ( 16 - 14 ) !} a^{2} b^{14} + \frac{16 !}{15 ! ( 16 - 15 ) !} a^{1} b^{15} + \frac{16 !}{16 ! ( 16 - 16 ) !} a^{0} b^{16}

Simplify

\frac{16 !}{0 ! ( 16 - 0 ) !} a^{16} b^{0} : a^{16}

Simplify

\frac{16 !}{1 ! ( 16 - 1 ) !} a^{15} b^{1} : 16 a^{15} b

Simplify

\frac{16 !}{2 ! ( 16 - 2 ) !} a^{14} b^{2} : 120 a^{14} b^{2}

Simplify

\frac{16 !}{3 ! ( 16 - 3 ) !} a^{13} b^{3} : 560 a^{13} b^{3}

Simplify

\frac{16 !}{4 ! ( 16 - 4 ) !} a^{12} b^{4} : 1820 a^{12} b^{4}

Simplify

\frac{16 !}{5 ! ( 16 - 5 ) !} a^{11} b^{5} : 4368 a^{11} b^{5}

Simplify

\frac{16 !}{6 ! ( 16 - 6 ) !} a^{10} b^{6} : 8008 a^{10} b^{6}

Simplify

\frac{16 !}{7 ! ( 16 - 7 ) !} a^{9} b^{7} : 11440 a^{9} b^{7}

Simplify

\frac{16 !}{8 ! ( 16 - 8 ) !} a^{8} b^{8} : 12870 a^{8} b^{8}

Simplify

\frac{16 !}{9 ! ( 16 - 9 ) !} a^{7} b^{9} : 11440 a^{7} b^{9}

Simplify

\frac{16 !}{10 ! ( 16 - 10 ) !} a^{6} b^{10} : 8008 a^{6} b^{10}

Simplify

\frac{16 !}{11 ! ( 16 - 11 ) !} a^{5} b^{11} : 4368 a^{5} b^{11}

Simplify

\frac{16 !}{12 ! ( 16 - 12 ) !} a^{4} b^{12} : 1820 a^{4} b^{12}

Simplify

\frac{16 !}{13 ! ( 16 - 13 ) !} a^{3} b^{13} : 560 a^{3} b^{13}

Simplify

\frac{16 !}{14 ! ( 16 - 14 ) !} a^{2} b^{14} : 120 a^{2} b^{14}

Simplify

\frac{16 !}{15 ! ( 16 - 15 ) !} a^{1} b^{15} : 16 a b^{15}

Simplify

\frac{16 !}{16 ! ( 16 - 16 ) !} a^{0} b^{16} : b^{16}

= a^{16} + 16 a^{15} b + 120 a^{14} b^{2} + 560 a^{13} b^{3} + 1820 a^{12} b^{4} + 4368 a^{11} b^{5} + 8008 a^{10} b^{6} + 11440 a^{9} b^{7} + 12870 a^{8} b^{8} + 11440 a^{7} b^{9} + 8008 a^{6} b^{10} + 4368 a^{5} b^{11} + 1820 a^{4} b^{12} + 560 a^{3} b^{13} + 120 a^{2} b^{14} + 16 a b^{15} + b^{16}

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