Pre-Algebra Examples

$f (x) = x^{2} - 18 x + 92$

Step 1

Check the leading coefficient of the function. This number is the coefficient of the expression with the largest degree.

Largest Degree: $2$

Leading Coefficient: $1$

Step 2

Create a list of the coefficients of the function except the leading coefficient of $1$ .

$- 18, 92$

Step 3

There will be two bound options, $b_{1}$ and $b_{2}$ , the smaller of which is the answer. To calculate the first bound option, find the absolute value of the largest coefficient from the list of coefficients. Then add $1$ .

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Step 3.1

Arrange the terms in ascending order.

$b_{1} = | - 18 |, | 92 |$

Step 3.2

The maximum value is the largest value in the arranged data set.

$b_{1} = | 92 |$

Step 3.3

The absolute value is the distance between a number and zero. The distance between $0$ and $92$ is $92$ .

$b_{1} = 92 + 1$

Step 3.4

Add $92$ and $1$ .

$b_{1} = 93$

Step 4

To calculate the second bound option, sum the absolute values of the coefficients from the list of coefficients. If the sum is greater than $1$ , use that number. If not, use $1$ .

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Step 4.1

Simplify each term.

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Step 4.1.1

The absolute value is the distance between a number and zero. The distance between $- 18$ and $0$ is $18$ .

$b_{2} = 18 + | 92 |$

Step 4.1.2

The absolute value is the distance between a number and zero. The distance between $0$ and $92$ is $92$ .

$b_{2} = 18 + 92$

Step 4.2

Add $18$ and $92$ .

$b_{2} = 110$

Step 4.3

Arrange the terms in ascending order.

$b_{2} = 1, 110$

Step 4.4

The maximum value is the largest value in the arranged data set.

$b_{2} = 110$

Step 5

Take the smaller bound option between $b_{1} = 93$ and $b_{2} = 110$ .

Smaller Bound: $93$

Step 6

Every real root on $f (x) = x^{2} - 18 x + 92$ lies between $- 93$ and $93$ .

$- 93$ and $93$