Expand the Trigonometric Expression (x-2y)^7

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

Step 1

Use the Binomial Theorem.

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

Step 2

Simplify each term.

Rewrite using the commutative property of multiplication.

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

Multiply $7$ by $- 2$ .

$x^{7} - 14 x^{6} y + 21 x^{5} {(- 2 y)}^{2} + 35 x^{4} {(- 2 y)}^{3} + 35 x^{3} {(- 2 y)}^{4} + 21 x^{2} {(- 2 y)}^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

Apply the product rule to $- 2 y$ .

$x^{7} - 14 x^{6} y + 21 x^{5} ({(- 2)}^{2} y^{2}) + 35 x^{4} {(- 2 y)}^{3} + 35 x^{3} {(- 2 y)}^{4} + 21 x^{2} {(- 2 y)}^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

Rewrite using the commutative property of multiplication.

$x^{7} - 14 x^{6} y + 21 \cdot {(- 2)}^{2} x^{5} y^{2} + 35 x^{4} {(- 2 y)}^{3} + 35 x^{3} {(- 2 y)}^{4} + 21 x^{2} {(- 2 y)}^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

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

$x^{7} - 14 x^{6} y + 21 \cdot 4 x^{5} y^{2} + 35 x^{4} {(- 2 y)}^{3} + 35 x^{3} {(- 2 y)}^{4} + 21 x^{2} {(- 2 y)}^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

Multiply $21$ by $4$ .

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} + 35 x^{4} {(- 2 y)}^{3} + 35 x^{3} {(- 2 y)}^{4} + 21 x^{2} {(- 2 y)}^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

Apply the product rule to $- 2 y$ .

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} + 35 x^{4} ({(- 2)}^{3} y^{3}) + 35 x^{3} {(- 2 y)}^{4} + 21 x^{2} {(- 2 y)}^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

Rewrite using the commutative property of multiplication.

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} + 35 \cdot {(- 2)}^{3} x^{4} y^{3} + 35 x^{3} {(- 2 y)}^{4} + 21 x^{2} {(- 2 y)}^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

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

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} + 35 \cdot - 8 x^{4} y^{3} + 35 x^{3} {(- 2 y)}^{4} + 21 x^{2} {(- 2 y)}^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

Multiply $35$ by $- 8$ .

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} - 280 x^{4} y^{3} + 35 x^{3} {(- 2 y)}^{4} + 21 x^{2} {(- 2 y)}^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

Apply the product rule to $- 2 y$ .

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} - 280 x^{4} y^{3} + 35 x^{3} ({(- 2)}^{4} y^{4}) + 21 x^{2} {(- 2 y)}^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

Rewrite using the commutative property of multiplication.

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} - 280 x^{4} y^{3} + 35 \cdot {(- 2)}^{4} x^{3} y^{4} + 21 x^{2} {(- 2 y)}^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

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

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} - 280 x^{4} y^{3} + 35 \cdot 16 x^{3} y^{4} + 21 x^{2} {(- 2 y)}^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

Multiply $35$ by $16$ .

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} - 280 x^{4} y^{3} + 560 x^{3} y^{4} + 21 x^{2} {(- 2 y)}^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

Apply the product rule to $- 2 y$ .

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} - 280 x^{4} y^{3} + 560 x^{3} y^{4} + 21 x^{2} ({(- 2)}^{5} y^{5}) + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

Rewrite using the commutative property of multiplication.

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} - 280 x^{4} y^{3} + 560 x^{3} y^{4} + 21 \cdot {(- 2)}^{5} x^{2} y^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

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

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} - 280 x^{4} y^{3} + 560 x^{3} y^{4} + 21 \cdot - 32 x^{2} y^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

Multiply $21$ by $- 32$ .

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} - 280 x^{4} y^{3} + 560 x^{3} y^{4} - 672 x^{2} y^{5} + 7 x {(- 2 y)}^{6} + {(- 2 y)}^{7}$

Apply the product rule to $- 2 y$ .

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} - 280 x^{4} y^{3} + 560 x^{3} y^{4} - 672 x^{2} y^{5} + 7 x ({(- 2)}^{6} y^{6}) + {(- 2 y)}^{7}$

Rewrite using the commutative property of multiplication.

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} - 280 x^{4} y^{3} + 560 x^{3} y^{4} - 672 x^{2} y^{5} + 7 \cdot {(- 2)}^{6} x y^{6} + {(- 2 y)}^{7}$

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

$x^{7} - 14 x^{6} y + 84 x^{5} y^{2} - 280 x^{4} y^{3} + 560 x^{3} y^{4} - 672 x^{2} y^{5} + 7 \cdot 64 x y^{6} + {(- 2 y)}^{7}$

Multiply $7$ by $64$ .

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

Apply the product rule to $- 2 y$ .

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

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

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

Expand the Trigonometric Expression (x-2y)^7

Related Questions

Support LCMGCF.com by disabling your adblocker.