Expand Using the Binomial Theorem (x+3y)^6

${(x + 3 y)}^{6}$

Step 1

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

$\sum_{k = 0}^{6} \frac{6!}{(6 - k)! k!} \cdot {(x)}^{6 - k} \cdot {(3 y)}^{k}$

Step 2

Expand the summation.

$\frac{6!}{(6 - 0)! 0!} {(x)}^{6 - 0} \cdot {(3 y)}^{0} + \frac{6!}{(6 - 1)! 1!} {(x)}^{6 - 1} \cdot {(3 y)}^{1} + \dots + \frac{6!}{(6 - 6)! 6!} {(x)}^{6 - 6} \cdot {(3 y)}^{6}$

Step 3

Simplify the exponents for each term of the expansion.

$1 \cdot {(x)}^{6} \cdot {(3 y)}^{0} + 6 \cdot {(x)}^{5} \cdot {(3 y)}^{1} + \dots + 1 \cdot {(x)}^{0} \cdot {(3 y)}^{6}$

Step 4

Simplify the polynomial result.

$x^{6} + 18 x^{5} y + 135 x^{4} y^{2} + 540 x^{3} y^{3} + 1215 x^{2} y^{4} + 1458 x y^{5} + 729 y^{6}$

Expand Using the Binomial Theorem (x+3y)^6

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