Basic Math Examples

${(3 a - 1)}^{3} - {(2 a - 3)}^{2}$

Step 1

Use the Binomial Theorem.

${(3 a)}^{3} + 3 {(3 a)}^{2} \cdot - 1 + 3 (3 a) {(- 1)}^{2} + {(- 1)}^{3} - {(2 a - 3)}^{2}$

Step 2

Simplify each term.

Tap for more steps...

Step 2.1

Apply the product rule to $3 a$ .

$3^{3} a^{3} + 3 {(3 a)}^{2} \cdot - 1 + 3 (3 a) {(- 1)}^{2} + {(- 1)}^{3} - {(2 a - 3)}^{2}$

Step 2.2

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

$27 a^{3} + 3 {(3 a)}^{2} \cdot - 1 + 3 (3 a) {(- 1)}^{2} + {(- 1)}^{3} - {(2 a - 3)}^{2}$

Step 2.3

Apply the product rule to $3 a$ .

$27 a^{3} + 3 (3^{2} a^{2}) \cdot - 1 + 3 (3 a) {(- 1)}^{2} + {(- 1)}^{3} - {(2 a - 3)}^{2}$

Step 2.4

Multiply $3$ by $3^{2}$ by adding the exponents.

Tap for more steps...

Step 2.4.1

Move $3^{2}$ .

$27 a^{3} + 3^{2} \cdot 3 a^{2} \cdot - 1 + 3 (3 a) {(- 1)}^{2} + {(- 1)}^{3} - {(2 a - 3)}^{2}$

Step 2.4.2

Multiply $3^{2}$ by $3$ .

Tap for more steps...

Step 2.4.2.1

Raise $3$ to the power of $1$ .

$27 a^{3} + 3^{2} \cdot 3^{1} a^{2} \cdot - 1 + 3 (3 a) {(- 1)}^{2} + {(- 1)}^{3} - {(2 a - 3)}^{2}$

Step 2.4.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$27 a^{3} + 3^{2 + 1} a^{2} \cdot - 1 + 3 (3 a) {(- 1)}^{2} + {(- 1)}^{3} - {(2 a - 3)}^{2}$

Step 2.4.3

Add $2$ and $1$ .

$27 a^{3} + 3^{3} a^{2} \cdot - 1 + 3 (3 a) {(- 1)}^{2} + {(- 1)}^{3} - {(2 a - 3)}^{2}$

Step 2.5

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

$27 a^{3} + 27 a^{2} \cdot - 1 + 3 (3 a) {(- 1)}^{2} + {(- 1)}^{3} - {(2 a - 3)}^{2}$

Step 2.6

Multiply $- 1$ by $27$ .

$27 a^{3} - 27 a^{2} + 3 (3 a) {(- 1)}^{2} + {(- 1)}^{3} - {(2 a - 3)}^{2}$

Step 2.7

Multiply $3$ by $3$ .

$27 a^{3} - 27 a^{2} + 9 a {(- 1)}^{2} + {(- 1)}^{3} - {(2 a - 3)}^{2}$

Step 2.8

Raise $- 1$ to the power of $2$ .

$27 a^{3} - 27 a^{2} + 9 a \cdot 1 + {(- 1)}^{3} - {(2 a - 3)}^{2}$

Step 2.9

Multiply $9$ by $1$ .

$27 a^{3} - 27 a^{2} + 9 a + {(- 1)}^{3} - {(2 a - 3)}^{2}$

Step 2.10

Raise $- 1$ to the power of $3$ .

$27 a^{3} - 27 a^{2} + 9 a - 1 - {(2 a - 3)}^{2}$

Step 3

Rewrite ${(2 a - 3)}^{2}$ as $(2 a - 3) (2 a - 3)$ .

$27 a^{3} - 27 a^{2} + 9 a - 1 - ((2 a - 3) (2 a - 3))$

Step 4

Expand $(2 a - 3) (2 a - 3)$ using the FOIL Method.

Tap for more steps...

Step 4.1

Apply the distributive property.

$27 a^{3} - 27 a^{2} + 9 a - 1 - (2 a (2 a - 3) - 3 (2 a - 3))$

Step 4.2

Apply the distributive property.

$27 a^{3} - 27 a^{2} + 9 a - 1 - (2 a (2 a) + 2 a \cdot - 3 - 3 (2 a - 3))$

Step 4.3

Apply the distributive property.

$27 a^{3} - 27 a^{2} + 9 a - 1 - (2 a (2 a) + 2 a \cdot - 3 - 3 (2 a) - 3 \cdot - 3)$

Step 5

Simplify and combine like terms.

Tap for more steps...

Step 5.1

Simplify each term.

Tap for more steps...

Step 5.1.1

Rewrite using the commutative property of multiplication.

$27 a^{3} - 27 a^{2} + 9 a - 1 - (2 \cdot 2 a \cdot a + 2 a \cdot - 3 - 3 (2 a) - 3 \cdot - 3)$

Step 5.1.2

Multiply $a$ by $a$ by adding the exponents.

Tap for more steps...

Step 5.1.2.1

Move $a$ .

$27 a^{3} - 27 a^{2} + 9 a - 1 - (2 \cdot 2 (a \cdot a) + 2 a \cdot - 3 - 3 (2 a) - 3 \cdot - 3)$

Step 5.1.2.2

Multiply $a$ by $a$ .

$27 a^{3} - 27 a^{2} + 9 a - 1 - (2 \cdot 2 a^{2} + 2 a \cdot - 3 - 3 (2 a) - 3 \cdot - 3)$

Step 5.1.3

Multiply $2$ by $2$ .

$27 a^{3} - 27 a^{2} + 9 a - 1 - (4 a^{2} + 2 a \cdot - 3 - 3 (2 a) - 3 \cdot - 3)$

Step 5.1.4

Multiply $- 3$ by $2$ .

$27 a^{3} - 27 a^{2} + 9 a - 1 - (4 a^{2} - 6 a - 3 (2 a) - 3 \cdot - 3)$

Step 5.1.5

Multiply $2$ by $- 3$ .

$27 a^{3} - 27 a^{2} + 9 a - 1 - (4 a^{2} - 6 a - 6 a - 3 \cdot - 3)$

Step 5.1.6

Multiply $- 3$ by $- 3$ .

$27 a^{3} - 27 a^{2} + 9 a - 1 - (4 a^{2} - 6 a - 6 a + 9)$

Step 5.2

Subtract $6 a$ from $- 6 a$ .

$27 a^{3} - 27 a^{2} + 9 a - 1 - (4 a^{2} - 12 a + 9)$

Step 6

Apply the distributive property.

$27 a^{3} - 27 a^{2} + 9 a - 1 - (4 a^{2}) - (- 12 a) - 1 \cdot 9$

Step 7

Simplify.

Tap for more steps...

Step 7.1

Multiply $4$ by $- 1$ .

$27 a^{3} - 27 a^{2} + 9 a - 1 - 4 a^{2} - (- 12 a) - 1 \cdot 9$

Step 7.2

Multiply $- 12$ by $- 1$ .

$27 a^{3} - 27 a^{2} + 9 a - 1 - 4 a^{2} + 12 a - 1 \cdot 9$

Step 7.3

Multiply $- 1$ by $9$ .

$27 a^{3} - 27 a^{2} + 9 a - 1 - 4 a^{2} + 12 a - 9$

Step 8

Subtract $4 a^{2}$ from $- 27 a^{2}$ .

$27 a^{3} - 31 a^{2} + 9 a - 1 + 12 a - 9$

Step 9

Add $9 a$ and $12 a$ .

$27 a^{3} - 31 a^{2} + 21 a - 1 - 9$

Step 10

Subtract $9$ from $- 1$ .

$27 a^{3} - 31 a^{2} + 21 a - 10$