Finite Math Examples

$C (x) = 27000 + 55 x + 0.2 x^{2}$ , $R (x) = 445 x - 0.8 x^{2}$

Step 1

Find the product of the functions.

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Step 1.1

Replace the function designators with the actual functions in $C (x) \cdot (R (x))$ .

$(27000 + 55 x + 0.2 x^{2}) \cdot (445 x - 0.8 x^{2})$

Step 1.2

Simplify.

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Step 1.2.1

Expand $(27000 + 55 x + 0.2 x^{2}) (445 x - 0.8 x^{2})$ by multiplying each term in the first expression by each term in the second expression.

$27000 (445 x) + 27000 (- 0.8 x^{2}) + 55 x (445 x) + 55 x (- 0.8 x^{2}) + 0.2 x^{2} (445 x) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2

Simplify terms.

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Step 1.2.2.1

Simplify each term.

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Step 1.2.2.1.1

Multiply $445$ by $27000$ .

$12015000 x + 27000 (- 0.8 x^{2}) + 55 x (445 x) + 55 x (- 0.8 x^{2}) + 0.2 x^{2} (445 x) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.2

Multiply $- 0.8$ by $27000$ .

$12015000 x - 21600 x^{2} + 55 x (445 x) + 55 x (- 0.8 x^{2}) + 0.2 x^{2} (445 x) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.3

Rewrite using the commutative property of multiplication.

$12015000 x - 21600 x^{2} + 55 \cdot 445 x \cdot x + 55 x (- 0.8 x^{2}) + 0.2 x^{2} (445 x) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.4

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

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Step 1.2.2.1.4.1

Move $x$ .

$12015000 x - 21600 x^{2} + 55 \cdot 445 (x \cdot x) + 55 x (- 0.8 x^{2}) + 0.2 x^{2} (445 x) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.4.2

Multiply $x$ by $x$ .

$12015000 x - 21600 x^{2} + 55 \cdot 445 x^{2} + 55 x (- 0.8 x^{2}) + 0.2 x^{2} (445 x) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.5

Multiply $55$ by $445$ .

$12015000 x - 21600 x^{2} + 24475 x^{2} + 55 x (- 0.8 x^{2}) + 0.2 x^{2} (445 x) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.6

Rewrite using the commutative property of multiplication.

$12015000 x - 21600 x^{2} + 24475 x^{2} + 55 \cdot - 0.8 x \cdot x^{2} + 0.2 x^{2} (445 x) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.7

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

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Step 1.2.2.1.7.1

Move $x^{2}$ .

$12015000 x - 21600 x^{2} + 24475 x^{2} + 55 \cdot - 0.8 (x^{2} x) + 0.2 x^{2} (445 x) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.7.2

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

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Step 1.2.2.1.7.2.1

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

$12015000 x - 21600 x^{2} + 24475 x^{2} + 55 \cdot - 0.8 (x^{2} x^{1}) + 0.2 x^{2} (445 x) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.7.2.2

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

$12015000 x - 21600 x^{2} + 24475 x^{2} + 55 \cdot - 0.8 x^{2 + 1} + 0.2 x^{2} (445 x) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.7.3

Add $2$ and $1$ .

$12015000 x - 21600 x^{2} + 24475 x^{2} + 55 \cdot - 0.8 x^{3} + 0.2 x^{2} (445 x) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.8

Multiply $55$ by $- 0.8$ .

$12015000 x - 21600 x^{2} + 24475 x^{2} - 44 x^{3} + 0.2 x^{2} (445 x) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.9

Rewrite using the commutative property of multiplication.

$12015000 x - 21600 x^{2} + 24475 x^{2} - 44 x^{3} + 0.2 \cdot 445 x^{2} x + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.10

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

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Step 1.2.2.1.10.1

Move $x$ .

$12015000 x - 21600 x^{2} + 24475 x^{2} - 44 x^{3} + 0.2 \cdot 445 (x \cdot x^{2}) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.10.2

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

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Step 1.2.2.1.10.2.1

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

$12015000 x - 21600 x^{2} + 24475 x^{2} - 44 x^{3} + 0.2 \cdot 445 (x^{1} x^{2}) + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.10.2.2

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

$12015000 x - 21600 x^{2} + 24475 x^{2} - 44 x^{3} + 0.2 \cdot 445 x^{1 + 2} + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.10.3

Add $1$ and $2$ .

$12015000 x - 21600 x^{2} + 24475 x^{2} - 44 x^{3} + 0.2 \cdot 445 x^{3} + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.11

Multiply $0.2$ by $445$ .

$12015000 x - 21600 x^{2} + 24475 x^{2} - 44 x^{3} + 89 x^{3} + 0.2 x^{2} (- 0.8 x^{2})$

Step 1.2.2.1.12

Rewrite using the commutative property of multiplication.

$12015000 x - 21600 x^{2} + 24475 x^{2} - 44 x^{3} + 89 x^{3} + 0.2 \cdot - 0.8 x^{2} x^{2}$

Step 1.2.2.1.13

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

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Step 1.2.2.1.13.1

Move $x^{2}$ .

$12015000 x - 21600 x^{2} + 24475 x^{2} - 44 x^{3} + 89 x^{3} + 0.2 \cdot - 0.8 (x^{2} x^{2})$

Step 1.2.2.1.13.2

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

$12015000 x - 21600 x^{2} + 24475 x^{2} - 44 x^{3} + 89 x^{3} + 0.2 \cdot - 0.8 x^{2 + 2}$

Step 1.2.2.1.13.3

Add $2$ and $2$ .

$12015000 x - 21600 x^{2} + 24475 x^{2} - 44 x^{3} + 89 x^{3} + 0.2 \cdot - 0.8 x^{4}$

Step 1.2.2.1.14

Multiply $0.2$ by $- 0.8$ .

$12015000 x - 21600 x^{2} + 24475 x^{2} - 44 x^{3} + 89 x^{3} - 0.16 x^{4}$

Step 1.2.2.2

Simplify by adding terms.

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Step 1.2.2.2.1

Add $- 21600 x^{2}$ and $24475 x^{2}$ .

$12015000 x + 2875 x^{2} - 44 x^{3} + 89 x^{3} - 0.16 x^{4}$

Step 1.2.2.2.2

Add $- 44 x^{3}$ and $89 x^{3}$ .

$12015000 x + 2875 x^{2} + 45 x^{3} - 0.16 x^{4}$

Step 2

The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.

Interval Notation:

$(- \infty, \infty)$

Set-Builder Notation:

${x | x \in ℝ}$

Step 3