Find the Degree, Leading Term, and Leading Coefficient (2x+y)^7

${(2 x + y)}^{7}$

Simplify the polynomial, then reorder it left to right starting with the highest degree term.

Use the Binomial Theorem.

${(2 x)}^{7} + 7 {(2 x)}^{6} y + 21 {(2 x)}^{5} y^{2} + 35 {(2 x)}^{4} y^{3} + 35 {(2 x)}^{3} y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

Simplify each term.

Apply the product rule to $2 x$ .

$2^{7} x^{7} + 7 {(2 x)}^{6} y + 21 {(2 x)}^{5} y^{2} + 35 {(2 x)}^{4} y^{3} + 35 {(2 x)}^{3} y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

Raise $2$ to the power of $7$ .

$128 x^{7} + 7 {(2 x)}^{6} y + 21 {(2 x)}^{5} y^{2} + 35 {(2 x)}^{4} y^{3} + 35 {(2 x)}^{3} y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

Apply the product rule to $2 x$ .

$128 x^{7} + 7 (2^{6} x^{6}) y + 21 {(2 x)}^{5} y^{2} + 35 {(2 x)}^{4} y^{3} + 35 {(2 x)}^{3} y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

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

$128 x^{7} + 7 (64 x^{6}) y + 21 {(2 x)}^{5} y^{2} + 35 {(2 x)}^{4} y^{3} + 35 {(2 x)}^{3} y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

Multiply $64$ by $7$ .

$128 x^{7} + 448 x^{6} y + 21 {(2 x)}^{5} y^{2} + 35 {(2 x)}^{4} y^{3} + 35 {(2 x)}^{3} y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

Apply the product rule to $2 x$ .

$128 x^{7} + 448 x^{6} y + 21 (2^{5} x^{5}) y^{2} + 35 {(2 x)}^{4} y^{3} + 35 {(2 x)}^{3} y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

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

$128 x^{7} + 448 x^{6} y + 21 (32 x^{5}) y^{2} + 35 {(2 x)}^{4} y^{3} + 35 {(2 x)}^{3} y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

Multiply $32$ by $21$ .

$128 x^{7} + 448 x^{6} y + 672 x^{5} y^{2} + 35 {(2 x)}^{4} y^{3} + 35 {(2 x)}^{3} y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

Apply the product rule to $2 x$ .

$128 x^{7} + 448 x^{6} y + 672 x^{5} y^{2} + 35 (2^{4} x^{4}) y^{3} + 35 {(2 x)}^{3} y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

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

$128 x^{7} + 448 x^{6} y + 672 x^{5} y^{2} + 35 (16 x^{4}) y^{3} + 35 {(2 x)}^{3} y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

Multiply $16$ by $35$ .

$128 x^{7} + 448 x^{6} y + 672 x^{5} y^{2} + 560 x^{4} y^{3} + 35 {(2 x)}^{3} y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

Apply the product rule to $2 x$ .

$128 x^{7} + 448 x^{6} y + 672 x^{5} y^{2} + 560 x^{4} y^{3} + 35 (2^{3} x^{3}) y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

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

$128 x^{7} + 448 x^{6} y + 672 x^{5} y^{2} + 560 x^{4} y^{3} + 35 (8 x^{3}) y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

Multiply $8$ by $35$ .

$128 x^{7} + 448 x^{6} y + 672 x^{5} y^{2} + 560 x^{4} y^{3} + 280 x^{3} y^{4} + 21 {(2 x)}^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

Apply the product rule to $2 x$ .

$128 x^{7} + 448 x^{6} y + 672 x^{5} y^{2} + 560 x^{4} y^{3} + 280 x^{3} y^{4} + 21 (2^{2} x^{2}) y^{5} + 7 (2 x) y^{6} + y^{7}$

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

$128 x^{7} + 448 x^{6} y + 672 x^{5} y^{2} + 560 x^{4} y^{3} + 280 x^{3} y^{4} + 21 (4 x^{2}) y^{5} + 7 (2 x) y^{6} + y^{7}$

Multiply $4$ by $21$ .

$128 x^{7} + 448 x^{6} y + 672 x^{5} y^{2} + 560 x^{4} y^{3} + 280 x^{3} y^{4} + 84 x^{2} y^{5} + 7 (2 x) y^{6} + y^{7}$

Multiply $2$ by $7$ .

$128 x^{7} + 448 x^{6} y + 672 x^{5} y^{2} + 560 x^{4} y^{3} + 280 x^{3} y^{4} + 84 x^{2} y^{5} + 14 x y^{6} + y^{7}$

$128 x^{7} + 448 x^{6} y + 672 x^{5} y^{2} + 560 x^{4} y^{3} + 280 x^{3} y^{4} + 84 x^{2} y^{5} + 14 x y^{6} + y^{7}$

$128 x^{7} + 448 x^{6} y + 672 x^{5} y^{2} + 560 x^{4} y^{3} + 280 x^{3} y^{4} + 84 x^{2} y^{5} + 14 x y^{6} + y^{7}$

The degree of a polynomial is the highest degree of its terms.

Identify the exponents on the variables in each term, and add them together to find the degree of each term.

$128 x^{7} \to 7$

$448 x^{6} y \to 7$

$672 x^{5} y^{2} \to 7$

$560 x^{4} y^{3} \to 7$

$280 x^{3} y^{4} \to 7$

$84 x^{2} y^{5} \to 7$

$14 x y^{6} \to 7$

$y^{7} \to 7$

The largest exponent is the degree of the polynomial.

$7$

$7$

The leading term in a polynomial is the term with the highest degree.

$128 x^{7}$

The leading coefficient of a polynomial is the coefficient of the leading term.

The leading term in a polynomial is the term with the highest degree.

$128 x^{7}$

The leading coefficient in a polynomial is the coefficient of the leading term.

$128$

$128$

List the results.

Polynomial Degree: $7$

Leading Term: $128 x^{7}$

Leading Coefficient: $128$

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