Precalculus Examples

$(x - 4) (x - 4) (x - 6 i) (x + 6 i)$

Step 1

Expand $(x - 4) (x - 4)$ using the FOIL Method.

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Step 1.1

Apply the distributive property.

$(x (x - 4) - 4 (x - 4)) (x - 6 i) (x + 6 i)$

Step 1.2

Apply the distributive property.

$(x \cdot x + x \cdot - 4 - 4 (x - 4)) (x - 6 i) (x + 6 i)$

Step 1.3

Apply the distributive property.

$(x \cdot x + x \cdot - 4 - 4 x - 4 \cdot - 4) (x - 6 i) (x + 6 i)$

Step 2

Simplify and combine like terms.

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Step 2.1

Simplify each term.

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Step 2.1.1

Multiply $x$ by $x$ .

$(x^{2} + x \cdot - 4 - 4 x - 4 \cdot - 4) (x - 6 i) (x + 6 i)$

Step 2.1.2

Move $- 4$ to the left of $x$ .

$(x^{2} - 4 \cdot x - 4 x - 4 \cdot - 4) (x - 6 i) (x + 6 i)$

Step 2.1.3

Multiply $- 4$ by $- 4$ .

$(x^{2} - 4 x - 4 x + 16) (x - 6 i) (x + 6 i)$

Step 2.2

Subtract $4 x$ from $- 4 x$ .

$(x^{2} - 8 x + 16) (x - 6 i) (x + 6 i)$

Step 3

Expand $(x^{2} - 8 x + 16) (x - 6 i)$ by multiplying each term in the first expression by each term in the second expression.

$(x^{2} x + x^{2} (- 6 i) - 8 x \cdot x - 8 x (- 6 i) + 16 x + 16 (- 6 i)) (x + 6 i)$

Step 4

Simplify each term.

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Step 4.1

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

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Step 4.1.1

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

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Step 4.1.1.1

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

$(x^{2} x^{1} + x^{2} (- 6 i) - 8 x \cdot x - 8 x (- 6 i) + 16 x + 16 (- 6 i)) (x + 6 i)$

Step 4.1.1.2

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

$(x^{2 + 1} + x^{2} (- 6 i) - 8 x \cdot x - 8 x (- 6 i) + 16 x + 16 (- 6 i)) (x + 6 i)$

Step 4.1.2

Add $2$ and $1$ .

$(x^{3} + x^{2} (- 6 i) - 8 x \cdot x - 8 x (- 6 i) + 16 x + 16 (- 6 i)) (x + 6 i)$

Step 4.2

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

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Step 4.2.1

Move $x$ .

$(x^{3} + x^{2} (- 6 i) - 8 (x \cdot x) - 8 x (- 6 i) + 16 x + 16 (- 6 i)) (x + 6 i)$

Step 4.2.2

Multiply $x$ by $x$ .

$(x^{3} + x^{2} (- 6 i) - 8 x^{2} - 8 x (- 6 i) + 16 x + 16 (- 6 i)) (x + 6 i)$

Step 4.3

Multiply $- 6$ by $- 8$ .

$(x^{3} + x^{2} (- 6 i) - 8 x^{2} + 48 x i + 16 x + 16 (- 6 i)) (x + 6 i)$

Step 4.4

Multiply $- 6$ by $16$ .

$(x^{3} + x^{2} (- 6 i) - 8 x^{2} + 48 x i + 16 x - 96 i) (x + 6 i)$

Step 5

Expand $(x^{3} + x^{2} (- 6 i) - 8 x^{2} + 48 x i + 16 x - 96 i) (x + 6 i)$ by multiplying each term in the first expression by each term in the second expression.

$x^{3} x + x^{3} (6 i) + x^{2} (- 6 i) x + x^{2} (- 6 i) (6 i) - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6

Simplify terms.

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Step 6.1

Simplify each term.

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Step 6.1.1

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

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Step 6.1.1.1

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

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Step 6.1.1.1.1

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

$x^{3} x^{1} + x^{3} (6 i) + x^{2} (- 6 i) x + x^{2} (- 6 i) (6 i) - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.1.1.2

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

$x^{3 + 1} + x^{3} (6 i) + x^{2} (- 6 i) x + x^{2} (- 6 i) (6 i) - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.1.2

Add $3$ and $1$ .

$x^{4} + x^{3} (6 i) + x^{2} (- 6 i) x + x^{2} (- 6 i) (6 i) - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.2

Move $6$ to the left of $x^{3}$ .

$x^{4} + 6 \cdot x^{3} i + x^{2} (- 6 i) x + x^{2} (- 6 i) (6 i) - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.3

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

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Step 6.1.3.1

Move $x$ .

$x^{4} + 6 x^{3} i + x \cdot x^{2} (- 6 i) + x^{2} (- 6 i) (6 i) - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.3.2

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

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Step 6.1.3.2.1

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

$x^{4} + 6 x^{3} i + x^{1} x^{2} (- 6 i) + x^{2} (- 6 i) (6 i) - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.3.2.2

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

$x^{4} + 6 x^{3} i + x^{1 + 2} (- 6 i) + x^{2} (- 6 i) (6 i) - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.3.3

Add $1$ and $2$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + x^{2} (- 6 i) (6 i) - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.4

Multiply $x^{2} (- 6 i) (6 i)$ .

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Step 6.1.4.1

Multiply $6$ by $- 6$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + x^{2} (- 36 i) i - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.4.2

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

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + x^{2} (- 36 (i^{1} i)) - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.4.3

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

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + x^{2} (- 36 (i^{1} i^{1})) - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.4.4

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

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + x^{2} (- 36 i^{1 + 1}) - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.4.5

Add $1$ and $1$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + x^{2} (- 36 i^{2}) - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.5

Rewrite $i^{2}$ as $- 1$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + x^{2} (- 36 \cdot - 1) - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.6

Multiply $- 36$ by $- 1$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + x^{2} \cdot 36 - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.7

Move $36$ to the left of $x^{2}$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 \cdot x^{2} - 8 x^{2} x - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.8

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

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Step 6.1.8.1

Move $x$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 (x \cdot x^{2}) - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.8.2

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

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Step 6.1.8.2.1

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

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 (x^{1} x^{2}) - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.8.2.2

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

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{1 + 2} - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.8.3

Add $1$ and $2$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 8 x^{2} (6 i) + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.9

Multiply $6$ by $- 8$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x i x + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.10

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

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Step 6.1.10.1

Move $x$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 (x \cdot x) i + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.10.2

Multiply $x$ by $x$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i + 48 x i (6 i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.11

Multiply $48 x i (6 i)$ .

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Step 6.1.11.1

Multiply $6$ by $48$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i + 288 x i i + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.11.2

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

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i + 288 x (i^{1} i) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.11.3

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

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i + 288 x (i^{1} i^{1}) + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.11.4

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

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i + 288 x i^{1 + 1} + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.11.5

Add $1$ and $1$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i + 288 x i^{2} + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.12

Rewrite $i^{2}$ as $- 1$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i + 288 x \cdot - 1 + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.13

Multiply $- 1$ by $288$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 x \cdot x + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.14

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

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Step 6.1.14.1

Move $x$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 (x \cdot x) + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.14.2

Multiply $x$ by $x$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 x^{2} + 16 x (6 i) - 96 i x - 96 i (6 i)$

Step 6.1.15

Multiply $6$ by $16$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 x^{2} + 96 x i - 96 i x - 96 i (6 i)$

Step 6.1.16

Multiply $- 96 i (6 i)$ .

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Step 6.1.16.1

Multiply $6$ by $- 96$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 x^{2} + 96 x i - 96 i x - 576 i i$

Step 6.1.16.2

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

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 x^{2} + 96 x i - 96 i x - 576 (i^{1} i)$

Step 6.1.16.3

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

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 x^{2} + 96 x i - 96 i x - 576 (i^{1} i^{1})$

Step 6.1.16.4

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

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 x^{2} + 96 x i - 96 i x - 576 i^{1 + 1}$

Step 6.1.16.5

Add $1$ and $1$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 x^{2} + 96 x i - 96 i x - 576 i^{2}$

Step 6.1.17

Rewrite $i^{2}$ as $- 1$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 x^{2} + 96 x i - 96 i x - 576 \cdot - 1$

Step 6.1.18

Multiply $- 576$ by $- 1$ .

$x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 x^{2} + 96 x i - 96 i x + 576$

Step 6.2

Simplify by adding terms.

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Step 6.2.1

Combine the opposite terms in $x^{4} + 6 x^{3} i + x^{3} (- 6 i) + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 x^{2} + 96 x i - 96 i x + 576$ .

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Step 6.2.1.1

Reorder the factors in the terms $6 x^{3} i$ and $x^{3} (- 6 i)$ .

$x^{4} + 6 i x^{3} - 6 i x^{3} + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 x^{2} + 96 x i - 96 i x + 576$

Step 6.2.1.2

Subtract $6 i x^{3}$ from $6 i x^{3}$ .

$x^{4} + 0 + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 x^{2} + 96 x i - 96 i x + 576$

Step 6.2.1.3

Add $x^{4}$ and $0$ .

$x^{4} + 36 x^{2} - 8 x^{3} - 48 x^{2} i + 48 x^{2} i - 288 x + 16 x^{2} + 96 x i - 96 i x + 576$

Step 6.2.1.4

Add $- 48 x^{2} i$ and $48 x^{2} i$ .

$x^{4} + 36 x^{2} - 8 x^{3} + 0 - 288 x + 16 x^{2} + 96 x i - 96 i x + 576$

Step 6.2.1.5

Add $x^{4} + 36 x^{2} - 8 x^{3}$ and $0$ .

$x^{4} + 36 x^{2} - 8 x^{3} - 288 x + 16 x^{2} + 96 x i - 96 i x + 576$

Step 6.2.1.6

Reorder the factors in the terms $96 x i$ and $- 96 i x$ .

$x^{4} + 36 x^{2} - 8 x^{3} - 288 x + 16 x^{2} + 96 i x - 96 i x + 576$

Step 6.2.1.7

Subtract $96 i x$ from $96 i x$ .

$x^{4} + 36 x^{2} - 8 x^{3} - 288 x + 16 x^{2} + 0 + 576$

Step 6.2.1.8

Add $x^{4} + 36 x^{2} - 8 x^{3} - 288 x + 16 x^{2}$ and $0$ .

$x^{4} + 36 x^{2} - 8 x^{3} - 288 x + 16 x^{2} + 576$

Step 6.2.2

Add $36 x^{2}$ and $16 x^{2}$ .

$x^{4} + 52 x^{2} - 8 x^{3} - 288 x + 576$

Step 6.2.3

Move $52 x^{2}$ .

$x^{4} - 8 x^{3} + 52 x^{2} - 288 x + 576$