Algebra Examples

${(2 x^{2} - 3 y)}^{3}$

Step 1

Pascal's Triangle can be displayed as such:

$1$

$1 - 1$

$1 - 2 - 1$

$1 - 3 - 3 - 1$

The triangle can be used to calculate the coefficients of the expansion of

${(a + b)}^{n}$ by taking the exponent

$n$ and adding

$1$ . The coefficients will correspond with line

$n + 1$ of the triangle. For

${(2 x^{2} - 3 y)}^{3}$ ,

$n = 3$ so the coefficients of the expansion will correspond with line

$4$ .

Step 2

The expansion follows the rule

${(a + b)}^{n} = c_{0} a^{n} b^{0} + c_{1} a^{n - 1} b^{1} + c_{n - 1} a^{1} b^{n - 1} + c_{n} a^{0} b^{n}$ . The values of the coefficients, from the triangle, are

$1 - 3 - 3 - 1$ .

$1 a^{3} b^{0} + 3 a^{2} b + 3 a b^{2} + 1 a^{0} b^{3}$

Step 3

Substitute the actual values of

$a$

$2 x^{2}$ and

$b$

$- 3 y$ into the expression.

$1 {(2 x^{2})}^{3} {(- 3 y)}^{0} + 3 {(2 x^{2})}^{2} {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4

Simplify each term.

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Step 4.1

Multiply

${(2 x^{2})}^{3}$ by

$1$ .

${(2 x^{2})}^{3} {(- 3 y)}^{0} + 3 {(2 x^{2})}^{2} {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.2

Apply the product rule to

$2 x^{2}$ .

$2^{3} {(x^{2})}^{3} {(- 3 y)}^{0} + 3 {(2 x^{2})}^{2} {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.3

Raise

$2$ to the power of

$3$ .

$8 {(x^{2})}^{3} {(- 3 y)}^{0} + 3 {(2 x^{2})}^{2} {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.4

Multiply the exponents in

${(x^{2})}^{3}$ .

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Step 4.4.1

Apply the power rule and multiply exponents,

${(a^{m})}^{n} = a^{m n}$ .

$8 x^{2 \cdot 3} {(- 3 y)}^{0} + 3 {(2 x^{2})}^{2} {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.4.2

Multiply

$2$ by

$3$ .

$8 x^{6} {(- 3 y)}^{0} + 3 {(2 x^{2})}^{2} {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.5

Apply the product rule to

$- 3 y$ .

$8 x^{6} ({(- 3)}^{0} y^{0}) + 3 {(2 x^{2})}^{2} {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.6

Rewrite using the commutative property of multiplication.

$8 \cdot {(- 3)}^{0} x^{6} y^{0} + 3 {(2 x^{2})}^{2} {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.7

Anything raised to

$0$ is

$1$ .

$8 \cdot 1 x^{6} y^{0} + 3 {(2 x^{2})}^{2} {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.8

Multiply

$8$ by

$1$ .

$8 x^{6} y^{0} + 3 {(2 x^{2})}^{2} {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.9

Anything raised to

$0$ is

$1$ .

$8 x^{6} \cdot 1 + 3 {(2 x^{2})}^{2} {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.10

Multiply

$8$ by

$1$ .

$8 x^{6} + 3 {(2 x^{2})}^{2} {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.11

Apply the product rule to

$2 x^{2}$ .

$8 x^{6} + 3 (2^{2} {(x^{2})}^{2}) {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.12

Raise

$2$ to the power of

$2$ .

$8 x^{6} + 3 (4 {(x^{2})}^{2}) {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.13

Multiply the exponents in

${(x^{2})}^{2}$ .

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Step 4.13.1

Apply the power rule and multiply exponents,

${(a^{m})}^{n} = a^{m n}$ .

$8 x^{6} + 3 (4 x^{2 \cdot 2}) {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.13.2

Multiply

$2$ by

$2$ .

$8 x^{6} + 3 (4 x^{4}) {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.14

Multiply

$4$ by

$3$ .

$8 x^{6} + 12 x^{4} {(- 3 y)}^{1} + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.15

Simplify.

$8 x^{6} + 12 x^{4} (- 3 y) + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.16

Rewrite using the commutative property of multiplication.

$8 x^{6} + 12 \cdot - 3 x^{4} y + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.17

Multiply

$12$ by

$- 3$ .

$8 x^{6} - 36 x^{4} y + 3 {(2 x^{2})}^{1} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.18

Simplify.

$8 x^{6} - 36 x^{4} y + 3 (2 x^{2}) {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.19

Multiply

$2$ by

$3$ .

$8 x^{6} - 36 x^{4} y + 6 x^{2} {(- 3 y)}^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.20

Apply the product rule to

$- 3 y$ .

$8 x^{6} - 36 x^{4} y + 6 x^{2} ({(- 3)}^{2} y^{2}) + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.21

Rewrite using the commutative property of multiplication.

$8 x^{6} - 36 x^{4} y + 6 \cdot {(- 3)}^{2} x^{2} y^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.22

Raise

$- 3$ to the power of

$2$ .

$8 x^{6} - 36 x^{4} y + 6 \cdot 9 x^{2} y^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.23

Multiply

$6$ by

$9$ .

$8 x^{6} - 36 x^{4} y + 54 x^{2} y^{2} + 1 {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.24

Multiply

${(2 x^{2})}^{0}$ by

$1$ .

$8 x^{6} - 36 x^{4} y + 54 x^{2} y^{2} + {(2 x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.25

Apply the product rule to

$2 x^{2}$ .

$8 x^{6} - 36 x^{4} y + 54 x^{2} y^{2} + 2^{0} {(x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.26

Anything raised to

$0$ is

$1$ .

$8 x^{6} - 36 x^{4} y + 54 x^{2} y^{2} + 1 {(x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.27

Multiply

${(x^{2})}^{0}$ by

$1$ .

$8 x^{6} - 36 x^{4} y + 54 x^{2} y^{2} + {(x^{2})}^{0} {(- 3 y)}^{3}$

Step 4.28

Multiply the exponents in

${(x^{2})}^{0}$ .

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Step 4.28.1

Apply the power rule and multiply exponents,

${(a^{m})}^{n} = a^{m n}$ .

$8 x^{6} - 36 x^{4} y + 54 x^{2} y^{2} + x^{2 \cdot 0} {(- 3 y)}^{3}$

Step 4.28.2

Multiply

$2$ by

$0$ .

$8 x^{6} - 36 x^{4} y + 54 x^{2} y^{2} + x^{0} {(- 3 y)}^{3}$

Step 4.29

Anything raised to

$0$ is

$1$ .

$8 x^{6} - 36 x^{4} y + 54 x^{2} y^{2} + 1 {(- 3 y)}^{3}$

Step 4.30

Multiply

${(- 3 y)}^{3}$ by

$1$ .

$8 x^{6} - 36 x^{4} y + 54 x^{2} y^{2} + {(- 3 y)}^{3}$

Step 4.31

Apply the product rule to

$- 3 y$ .

$8 x^{6} - 36 x^{4} y + 54 x^{2} y^{2} + {(- 3)}^{3} y^{3}$

Step 4.32

Raise

$- 3$ to the power of

$3$ .

$8 x^{6} - 36 x^{4} y + 54 x^{2} y^{2} - 27 y^{3}$