Q. 29 In Exercises 28-33 x聽represents... [FREE SOLUTION]

91影视

Geometry

Ray C. Jurgensen, Richard G. Brown, John W. Jurgensen

$Math Studyset 91影视 Explanations$ Math

Student Edition 路 227 pages

ISBN: 9780395977279

Chapter 4: Q. 29 (page 163)

In Exercises 28-33 xrepresents the length of a segment. When a value of xdoesn't make sense as a length, eliminate that value of x.
$x^{2} 鈭� 400 = 0$

Short Answer

Expert verified

The values of is $x = 20$

Step by step solution

- Understand the concept used

if $a x^{2} + b x + c = 0$ with $a 鈮� 0$ then $x = \frac{鈭� b 卤 \sqrt{b^{2} 鈭� 4 a c}}{2 a}$ Solving using factoring can be done by splitting the middle term of equation and then making groups and equating them to zero.

- Substitute the values

It is given that $x^{2} 鈭� 400 = 0$ Using quadratic formula $x = \frac{鈭� b 卤 \sqrt{b^{2} 鈭� 4 a c}}{2 a}$

, substitute 1 for a, 0 for b and -400 for c.

Put the values in the formula and get $x = \frac{鈭� (0) 卤 \sqrt{{(0)}^{2} 鈭� 4 脳 (1) 脳 (鈭� 400)}}{2 (1)}$ .

- Simplify for x

Simplify the expression for x.

$\begin{matrix} x = \frac{鈭� (0) 卤 \sqrt{{(0)}^{2} 鈭� 4 脳 (1) 脳 (鈭� 400)}}{2 (1)} \\ = \frac{卤 \sqrt{1600}}{2} \\ = \frac{卤 40}{2} \end{matrix}$

Therefore, either $x = \frac{40}{2}$ or $x = \frac{鈭� 40}{2}$ that is., either $x = 20$ or $x = 20$ Here, the is having two values. 20 and -20. Since, is a length of a segment that could not be negative, therefore, the value of is 20.

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91影视

In Exercises 28-33 xrepresents the length of a segment. When a value of xdoesn't make sense as a length, eliminate that value of x.
$x^{2} 鈭� 400 = 0$

Short Answer

Step by step solution

- Understand the concept used

- Substitute the values

- Simplify for x

One App. One Place for Learning.

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91影视

In Exercises 28-33 xrepresents the length of a segment. When a value of xdoesn't make sense as a length, eliminate that value of x.x2鈭�400=0

Short Answer

Step by step solution

- Understand the concept used

- Substitute the values

- Simplify for x

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Theoretical and Mathematical Physics

Pure Maths

Calculus

Applied Mathematics

Probability and Statistics

Geometry

Study anywhere. Anytime. Across all devices.

In Exercises 28-33 xrepresents the length of a segment. When a value of xdoesn't make sense as a length, eliminate that value of x.
$x^{2} 鈭� 400 = 0$