Algebra Examples

${(2 x^{2} - 9 x + 2)}^{2} - 4$

Step 1

Simplify each term.

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Step 1.1

Rewrite ${(2 x^{2} - 9 x + 2)}^{2}$ as $(2 x^{2} - 9 x + 2) (2 x^{2} - 9 x + 2)$ .

$(2 x^{2} - 9 x + 2) (2 x^{2} - 9 x + 2) - 4$

Step 1.2

Expand $(2 x^{2} - 9 x + 2) (2 x^{2} - 9 x + 2)$ by multiplying each term in the first expression by each term in the second expression.

$2 x^{2} (2 x^{2}) + 2 x^{2} (- 9 x) + 2 x^{2} \cdot 2 - 9 x (2 x^{2}) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3

Simplify each term.

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Step 1.3.1

Rewrite using the commutative property of multiplication.

$2 \cdot 2 x^{2} x^{2} + 2 x^{2} (- 9 x) + 2 x^{2} \cdot 2 - 9 x (2 x^{2}) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.2

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

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Step 1.3.2.1

Move $x^{2}$ .

$2 \cdot 2 (x^{2} x^{2}) + 2 x^{2} (- 9 x) + 2 x^{2} \cdot 2 - 9 x (2 x^{2}) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.2.2

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

$2 \cdot 2 x^{2 + 2} + 2 x^{2} (- 9 x) + 2 x^{2} \cdot 2 - 9 x (2 x^{2}) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.2.3

Add $2$ and $2$ .

$2 \cdot 2 x^{4} + 2 x^{2} (- 9 x) + 2 x^{2} \cdot 2 - 9 x (2 x^{2}) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.3

Multiply $2$ by $2$ .

$4 x^{4} + 2 x^{2} (- 9 x) + 2 x^{2} \cdot 2 - 9 x (2 x^{2}) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.4

Rewrite using the commutative property of multiplication.

$4 x^{4} + 2 \cdot - 9 x^{2} x + 2 x^{2} \cdot 2 - 9 x (2 x^{2}) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.5

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

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Step 1.3.5.1

Move $x$ .

$4 x^{4} + 2 \cdot - 9 (x \cdot x^{2}) + 2 x^{2} \cdot 2 - 9 x (2 x^{2}) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.5.2

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

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Step 1.3.5.2.1

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

$4 x^{4} + 2 \cdot - 9 (x^{1} x^{2}) + 2 x^{2} \cdot 2 - 9 x (2 x^{2}) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.5.2.2

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

$4 x^{4} + 2 \cdot - 9 x^{1 + 2} + 2 x^{2} \cdot 2 - 9 x (2 x^{2}) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.5.3

Add $1$ and $2$ .

$4 x^{4} + 2 \cdot - 9 x^{3} + 2 x^{2} \cdot 2 - 9 x (2 x^{2}) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.6

Multiply $2$ by $- 9$ .

$4 x^{4} - 18 x^{3} + 2 x^{2} \cdot 2 - 9 x (2 x^{2}) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.7

Multiply $2$ by $2$ .

$4 x^{4} - 18 x^{3} + 4 x^{2} - 9 x (2 x^{2}) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.8

Rewrite using the commutative property of multiplication.

$4 x^{4} - 18 x^{3} + 4 x^{2} - 9 \cdot 2 x \cdot x^{2} - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.9

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

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Step 1.3.9.1

Move $x^{2}$ .

$4 x^{4} - 18 x^{3} + 4 x^{2} - 9 \cdot 2 (x^{2} x) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.9.2

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

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Step 1.3.9.2.1

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

$4 x^{4} - 18 x^{3} + 4 x^{2} - 9 \cdot 2 (x^{2} x^{1}) - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.9.2.2

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

$4 x^{4} - 18 x^{3} + 4 x^{2} - 9 \cdot 2 x^{2 + 1} - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.9.3

Add $2$ and $1$ .

$4 x^{4} - 18 x^{3} + 4 x^{2} - 9 \cdot 2 x^{3} - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.10

Multiply $- 9$ by $2$ .

$4 x^{4} - 18 x^{3} + 4 x^{2} - 18 x^{3} - 9 x (- 9 x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.11

Rewrite using the commutative property of multiplication.

$4 x^{4} - 18 x^{3} + 4 x^{2} - 18 x^{3} - 9 \cdot - 9 x \cdot x - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.12

Multiply $x$ by $x$ by adding the exponents.

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Step 1.3.12.1

Move $x$ .

$4 x^{4} - 18 x^{3} + 4 x^{2} - 18 x^{3} - 9 \cdot - 9 (x \cdot x) - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.12.2

Multiply $x$ by $x$ .

$4 x^{4} - 18 x^{3} + 4 x^{2} - 18 x^{3} - 9 \cdot - 9 x^{2} - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.13

Multiply $- 9$ by $- 9$ .

$4 x^{4} - 18 x^{3} + 4 x^{2} - 18 x^{3} + 81 x^{2} - 9 x \cdot 2 + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.14

Multiply $2$ by $- 9$ .

$4 x^{4} - 18 x^{3} + 4 x^{2} - 18 x^{3} + 81 x^{2} - 18 x + 2 (2 x^{2}) + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.15

Multiply $2$ by $2$ .

$4 x^{4} - 18 x^{3} + 4 x^{2} - 18 x^{3} + 81 x^{2} - 18 x + 4 x^{2} + 2 (- 9 x) + 2 \cdot 2 - 4$

Step 1.3.16

Multiply $- 9$ by $2$ .

$4 x^{4} - 18 x^{3} + 4 x^{2} - 18 x^{3} + 81 x^{2} - 18 x + 4 x^{2} - 18 x + 2 \cdot 2 - 4$

Step 1.3.17

Multiply $2$ by $2$ .

$4 x^{4} - 18 x^{3} + 4 x^{2} - 18 x^{3} + 81 x^{2} - 18 x + 4 x^{2} - 18 x + 4 - 4$

Step 1.4

Subtract $18 x^{3}$ from $- 18 x^{3}$ .

$4 x^{4} - 36 x^{3} + 4 x^{2} + 81 x^{2} - 18 x + 4 x^{2} - 18 x + 4 - 4$

Step 1.5

Add $4 x^{2}$ and $81 x^{2}$ .

$4 x^{4} - 36 x^{3} + 85 x^{2} - 18 x + 4 x^{2} - 18 x + 4 - 4$

Step 1.6

Add $85 x^{2}$ and $4 x^{2}$ .

$4 x^{4} - 36 x^{3} + 89 x^{2} - 18 x - 18 x + 4 - 4$

Step 1.7

Subtract $18 x$ from $- 18 x$ .

$4 x^{4} - 36 x^{3} + 89 x^{2} - 36 x + 4 - 4$

Step 2

Combine the opposite terms in $4 x^{4} - 36 x^{3} + 89 x^{2} - 36 x + 4 - 4$ .

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Step 2.1

Subtract $4$ from $4$ .

$4 x^{4} - 36 x^{3} + 89 x^{2} - 36 x + 0$

Step 2.2

Add $4 x^{4} - 36 x^{3} + 89 x^{2} - 36 x$ and $0$ .

$4 x^{4} - 36 x^{3} + 89 x^{2} - 36 x$