Chapter 2: Q. 2 (page 68)

If $x = - 2$ , the value of the expression $3 x^{2} - 5 x + \frac{1}{x}$ is _______.

Short Answer

Expert verified

The value of expression is $\frac{43}{2}$ .

Step by step solution

Step 1. Given Information

If $x = - 2$ , the value of the expression $3 x^{2} - 5 x + \frac{1}{x}$ is _______.

Step 2. The given expression is 3x2-5x+1x

We find the value of expression after putting $x = - 2$ .

Step 3. Putting x=-2 in the given expression

$= 3 {(- 2)}^{2} - 5 (- 2) + \frac{1}{(- 2)}$

Simplifying the expression

$= 3 \times 4 + 10 - \frac{1}{2} = 12 + 10 - \frac{1}{2} = 22 - \frac{1}{2}$

Step 4. The LCD is 2.

So $= 22 \times \frac{2}{2} - \frac{1}{2}$

$= \frac{44}{2} - \frac{1}{2} = \frac{44 - 1}{2} = \frac{43}{2}$

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If $x = - 2$ , the value of the expression $3 x^{2} - 5 x + \frac{1}{x}$ is _______.

Short Answer

Step by step solution

Step 1. Given Information

Step 2. The given expression is 3x2-5x+1x

Step 3. Putting x=-2 in the given expression

Step 4. The LCD is 2.

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If x=-2, the value of the expression 3x2-5x+1xis _______.

Short Answer

Step by step solution

Step 1. Given Information

Step 2. The given expression is 3x2-5x+1x

Step 3. Putting x=-2 in the given expression

Step 4. The LCD is 2.

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Probability and Statistics

Logic and Functions

Discrete Mathematics

Statistics

Theoretical and Mathematical Physics

Pure Maths

Study anywhere. Anytime. Across all devices.

If $x = - 2$ , the value of the expression $3 x^{2} - 5 x + \frac{1}{x}$ is _______.